Part - Leutron GmbH

Safety and Reliability 

Jörg Jelen 

Safety and Reliability 

Dear valued customers and prospects, 

You now hold the latest Leutron catalogue in your 

hands which will provide you with an overview of our 

products along with a lot of technical information, 

concepts and high performance solutions. 

It offers you recommendations and assistance for the 

selection of an effective surge protection. 

Build-up of isolated spark gap 

Not only our products, but personalized 

approach and support, customer trainings at 

our location or at the customer’s site, as well as 

our flexible solutions and short decision-making 

processes proof that safety is the priority of 

every staff member. 

We thank you and our business partners for 

your trust and hope our commitment helps you 

to gain more success and safety. 

Leutron protects people and valuables for more than 

50 years and is engaged in limitation of surge voltages 

and discharging of impulse currents for your 

benefit as a customer. 

We offer you a maximum of safety, quality and 

durability, guaranteed by sophisticated production 

processes such as high temperature soldering and 

vacuum technology, ground-breaking product development, 

years of experience and the know- how 

resulting out of this. 

Jörg Jelen 

General manager 

State-of-the-art technology is the foundation of our 

products and recent developments. Together with 

our customers we create innovative solutions for all 

individual problems and provide solutions for various 

applications. 

We ensure the operation of your installations and 

equipment even in rough industrial environment 

and prevent their breakdown during heavy thunderstorms. 

On the following pages we present protection devices 

for electronic products, information technology 

systems, for AC diverting and for current and voltage 

transformers which provide the highest possible 

degree of safety for you. 

1

Success for more than 50 years! 

metal ceramics GDT 1970 Metal glass discharge tube 1960 

Leutrons Product portfolio includes among 

other things: 

Newly developed combined arresters: 

The complete units are applicable for all LPLs 

with TN, TT, and IT net systems 

Protection devices with EMI filter up to 200A: 

LEUTRON provides the EnerPro with low-pass filter 

(EPF) for the protection of sensible electronic 

equipment against surges and power failures, 

caused by switching operations in the networks 

(transients) or by lightning strikes. 

AC arrester PLPro: 

LEUTRON introduces a maintenance free AC arrester. 

The device is part of cathodic corrosion protection 

concepts where it is used to avoid influences of 

AC voltage. 

Hermetically sealed, inert (rare) gas-filled 

isolating spark gaps with high extinguishing 

capacity 

LEUTRON produces customer sized isolating 

spark gaps with a high quality standard. They 

can be provided in many different sizes and 

styles for all network forms. 

Hermetically sealed, inert gas-filled high performance 

isolating spark gaps 

Leutron offers the first ATEX-tested and 

certified TSF (Ex-protection isolating spark 

gap TC 100A) 

At the single entry point (SEP) the surge protection 

devices for all copper lines are installed. Therefore the 

principle offers all possibilities for customer wished 

modification of the lightning and surge protection 

and the possibility to utilize all kinds of protection. 

At the single entry point (SEP) the surge protection 

devices for all copper lines are installed. Therefore the 

principle offers all possibilities for customer wished 

modification of the lightning and surge protection 

and the possibility to utilize all kinds of protection. 

For optimum protection against surges our 

arresters are installed according to the SEP 

(single-entry-point) concept, which is an easyto-handle 

and simple to understand way of 

protecting. Here all incoming and outgoing 

copper-lines of a protection zone are connected 

at one single point (SEP) and thus all kinds of 

potential disturbances can be controlled and no 

uncontrolled spreading of potential differences 

or respectively galvanic coupling are possible 

any more. 

2

High performance 

electrodes 

Gas tube arrester 

High performance 

copper electrodes Cu 

Impressions of manufacturing 

Leutron products are presented on 

every important exhibition worldwide. 

Light & Building 

eltefa 

Lightning and surge protection solutions 

are of interest everywhere. 

Slowakei 

Japan 

3

Awarded! 

VDE 

Network future – we’re in. 

Siemens: 

Fit-for-Future: 

ISO 9001:2000 

Quality and your safety are what we care for. 

History, present and future of surge protection. 

Our business ambition will be your benefit. 

4

Contents Overview 

Security and Reliability............................................................................................................................................. 1 

Quality and Reliability............................................................................................................................................... 2 

Activities......................................................................................................................................................................... 3 

Rewards.......................................................................................................................................................................... 4 

Contents Overview..................................................................................................................................................... 5 

Technological Details................................................................................................................................... 6 

Overview of Standards.............................................................................................................................................. 6 

Terms............................................................................................................................................................................... 7 

Power Engineering.......................................................................................................................................13 

Overview of SPD Wiring..........................................................................................................................14 

Selection Guide: Surge Voltage Protection in Power Supply.....................................................18 

Quick Selection of Products...................................................................................................................20 

Product Overview for Power Engineering........................................................................................24 

Total Package for Pipeline Protection.................................................................. 124 

Protection of Photovoltaic Installations............................................................. 133 

Information Technology....................................................................................................................... 163 

Quick Selection of Products................................................................................................................ 164 

Test Categories for SPDs in Information Technology................................................................. 165 

Product Overview for Information Technology........................................................................... 166 

Wiring Diagrams for LSA Equipment................................................................... 219 

Protection Devices for Measuring Transformers........................................................... 223 

Class I+II SPDs with Temperature Monitoring.............................................................................. 224 

Rare-Gas-Filled Isolation Spark Gaps....................................................................................... 225 

Spark Gaps for Indoor Application over 70 V ac.......................................................................... 227 

Spark Gaps for Outdoor Application over 50 V ac...................................................................... 229 

Spark Gaps for Areas in Danger of Explosion, ATEX................................................................... 233 

Spark Gaps for Hat-Rail Mounting.................................................................................................... 234 

Protection Devices for AC Arresting.......................................................................................... 235 

AC Arresters over 40 A with Class I Lightning Conductor........................................................ 236 

Digital Measuring Instrument and Test Kits....................................................................... 237 

Tester for Lightning and Surge Voltage Arresters....................................................................... 238 

Tester for Surge Voltage Protectors with Varistors/Diodes...................................................... 239 

Combined Tester..................................................................................................................................... 240 

Portable Test Equipment for LSA Magazines................................................................................ 241 

Pulse Counter........................................................................................................................................... 242 

Technological Details.............................................................................................................................. 244 

Origins of Surge Voltages.................................................................................................................................... 244 

Types of Surge Voltages Inductions................................................................................................................ 246 

Installation Instructions....................................................................................................................................... 247 

Combination Concept: Lightning Protection Zones and SEP Concept (SEP-Prinzip®)................. 252 

SEP Concept............................................................................................................................................................. 253 

Numeric Product Register................................................................................................................................... 254 

Alphabetical Product Register.......................................................................................................................... 259 

General Terms and Conditions of Sale........................................................................................................... 264 

How to find us......................................................................................................................................................... 266 

Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de 

5

Technological Details 

Overview of Standards 

• DIN VDE 0100-443:2007-06, chapter 44: Protection against surge voltages, chapter 443: Protection against surge 

voltages caused by atmospheric influences or switching operations 

• DIN VDE 0100-534:2009-02, Low-voltage electrical installations – Selection and erection of electrical equipment – 

Devices for protection against overvoltages German implementation of IEC 60364-5-53, part 534: Electrical 

installations of buildings 

• IEC 62305 part 1-4:2006-01, International standard for protection against lightning 

• DIN EN 62305; VDE 0185-305 1-4:2006-11, German implementation of IEC 62305 part 1-4:2006-01 

• DIN VDE 0800-1; VDE 0800-1:1989-05, Telecommunications; general concepts; requirements and tests for the safety 

of facilities and apparatus 

• DIN VDE 0800-2; VDE 0800-2:1985-07, Telecommunications; earthing and equipotential bonding 

• DIN VDE 0800-10; VDE 0800-10:1991-03, Telecommunications; transitional requirements on erection and operation 

of installations 

• DIN EN 50174-2; VDE 0800-174-2:2009-09, Information technology – Cabling installation – Part 2: Installation 

planning and practices inside buildings; German version EN 50174-2:2009 

• DIN EN 50310; VDE 0800-2-310:2006-10, Application of equipotential bonding and earthing in buildings with 

information technology equipment; German version EN 50310:2006 

• DIN EN 61663-1; VDE 0845-4-1:2000-07, Lightning protection – Telecommunication lines – Part 1: Fibre optic 

installations (IEC 61663-1:1999 + Corrigendum 1999); German version EN 61663-1:1999 

• DIN EN 61663-2; VDE 0845-4-2:2002-07, Lightning protection – Telecommunication lines – Part 2: Lines using 

metallic conductors (IEC 61633-2:2001); German version EN 61663-2:2001 

• IEC 61643-22:2004-05, Surge protective devices connected to telecommunications and signalling networks – 

Selection and application principles 

• DIN CLC/TS 61643-22; VDE V 0845-3-2:2007-09, (German version of IEC 61643-22:2004, modified) Surge protective 

devices connected to telecommunications and signalling networks – Selection and application principles 

• DIN IEC 61400-24; VDE 0127-24:2009-03, Wind turbines – Part 24: Lightning protection (IEC 88/322/CD:2008) 

• VdS 2010:2005-07, Risk-oriented protection against lightning and overvoltages, directives for damage prevention 

• VdS Damage prevention at the Gesamtverband der Schadenversicherer e.V. (German Damage Insurers‘ General 

Association) 

• VdS 2031:2005-10, Protection against lightning and overvoltages in electrical installations, directives for loss 

prevention 

• VdS 2019:2010-01, Overvoltage protection in residential buildings 

• VdS 2258:1993-07, Protection against overvoltages 

• VdS 2569:1999-01, Overvoltage protection for electronic data processing systems, directives for damage prevention 

Overview of Product Standards 

• IEC 61643-1:2005-03 Part 1, Surge protective devices connected to low-voltage power distribution systems – 

Requirements and tests 

• DIN EN 61643-11; VDE 0675-6-11:2007-08, Low-voltage surge protective devices – Part 11: Surge protective devices 

connected to low-voltage power systems – Requirements and tests (IEC 61643-1:1998 + corrigendum 1998, modified); 

German version EN 61643-11:2002 + A11:2007 

• DIN EN 61643-21; VDE 0845-3-1:2010-03, Low voltage surge protective devices – Part 21: Surge protective devices 

connected to telecommunications and signalling networks – Performance requirements and testing methods, 

(IEC 61643-21:2000 + Corrigendum 2001 + A1:2008, modified); German version EN 61643-21:2001 + A1:2009 

6 Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de


Technical Terms 

Active Parts 

Active parts are conductors and conductive parts of equipment that 

are alive under normal operational conditions. 

Aging 

Aging is the alteration of the original conductivity. It is caused by disturbance 

pulses, normal operation or unfavourable environmental 

conditions. 

Approach (today: Separation Distance) 

An approach is a too narrow distance between the lightning protection 

installation and conductive installations or electrical installations 

with a risk of a flashover or breakdown at lightning strikes. 

Arc Voltages U bo 

The arc voltage is the instantaneous value of the voltage over a discharge 

path during an arc discharge process. 

Arresters 

Equipment that in general consists of voltage-controlled resistors 

and/or spark gaps. Both items can be used separately or connected 

in series or in parallel. Arresters protect other electrical equipment or 

installations against unacceptable high surge voltages. 

Asymmetrical Interference 

“Asymmetrical” means that the interference source or drain is related 

to the ground. It exists a capacitive or galvanic connection to the 

protective conductor. 

Asymmetrical Voltage, Common-Mode Voltage 

Average voltage between every conductor and a specified reference 

point, usually reference earth or ground. 

Burst 

A burst consists of repeatedly occurring pulses within a certain time 

period. 

Combined Arrester 

The combined arrester is a surge-voltage protection device 

consisting of lightning current arrester and surge arrester. 

Combined Impulse 

A combined impulse is generated by a combination wave generator 

which generates a no-load impulse voltage (1.2/50), respectively, 

a short-circuit impulse current (8/20). The voltage, the amplitude of 

the current and the waveforms are determined by the generator and 

the impedance of the SPD. The ratio of the peak values of the noload 

voltage and the short-circuit current is 2 Ω. This value is called 

the fictitious impedance Z f . The short-circuit current is referred to as 

I cs . U oc is the no-load voltage of the generator. 

Critical Discharge Current i SG 

The critical discharge current is a current pulse of the waveform 

8/20 μs which just about triggers the disconnection device and 

which does not yet lead to a mechanical damage of the arrester. 

Direct or Close-up Strikes 

Direct and close-up strikes cause surge voltages with an energy content 

that contains a considerable part of the total energy of a lightning 

discharge. 

Disconnection Device 

If an arrester fails to operate, the disconnection device separates it 

from the power grid to avoid a fire hazard and to report the defective 

arrester. Note: It is not the task of the disconnection device to 

ensure the protective measure „Protection at indirect contact“. 

Disturbance Voltage, symmetrical 

The symmetrical disturbance voltage is a disturbance voltage between 

two wires of a conductor (e.g. at a double-circuit line) or between 

the terminals of an electrical installation for such a line. 

Double-port SPD 

A double-port SPD has separate input and output terminals with a 

series impedance between them. 

Earth 

Earth signifies the ground or the soil. 

Earthing (noun) 

Earthing refers to the total of all means and measures for earthing. 

Earthing (verb) 

To earth means to connect a conductive part, e.g. the lightning protection 

installation, via an earth-termination system to the earth. 

Earthing Conductor 

The earthing conductor connects the installation which has to be 

earthed with the earthing electrode, as far as the earthing conductor 

runs above soil or insulated in the soil. 

Earthing Electrode 

An earthing electrode is a conductor buried into the ground with an 

electrically conductive connection to the earth. Parts of connectors 

that run to the earthing electrode which are lying non-insulated in 

the ground are part of the earthing electrode as well. 

Electromagnetic Compatibility (EMC) 

The electromagnetic compatibility of a device or a system is its capability 

of a satisfactory operation in its electromagnetic environment, 

without causing unacceptable electromagnetic disturbances to other 

installations in this environment. 


7



Electromagnetic Interference 

The electromagnetic interference refers to a quality loss in operational 

behaviour, a malfunction or the breakdown of an electrical or 

electronically device caused by an electromagnetic disturbance. 

Impulse Current (8/20) 

This impulse current has a front time of 8 μs and a time to half-value 

of 20 μs. 

Electrostatic Discharge (e.s.d.) 

An electrostatic discharge is the transfer of electric charges between 

objects with different electrostatic potentials, which takes place at 

approximation or contact. 

Endurance Test 

In an endurance test the surge arrester has to undergo load tests, 

that simulate loads frequently occurring in practice. 

Equipotential Bonding (Potential Equalization) 

Potential equalization means to remove potential differences (at the 

operation of consumer‘s electrical installations), e.g. between the 

protective conductor of the electrical power installation and the 

pipes for the water, gas and heating supply, as well as between the 

individual pipes. The equipotential bonding at lightning effects requires 

measures beyond the specifications of VDE 0190. Therefore, 

the lightning protection installation is connected to other conductive 

installations via conductors or isolation spark gaps and, if necessary, 

to active parts of electrical installations via surge protection 

devices. These measures are called “lightning protection potential 

equalization”. 

Equipotential Bonding Bar 

This bar connects protective conductors, potential equalization conductors 

and, where applicable, functional earthing conductors with 

the earthing conductor and the earth electrodes. 

Impulse Discharge Current 

Discharge current that flows through the arrester after it is triggered. 

It is given as a peak value. The nominal impulse discharge current is 

the peak value of an impulse current of the pulse form 8/20 μs. 

Impulse Sparkover Voltage of a Surge Protection Device 

Highest voltage value between the electrodes of the spark gap of a 

surge protection device, just before the sparkover occurs. 

Impulse Voltage (1.2/50) 

This impulse voltage has a front time (between 10 % and 90 % of its 

peak value) of 1,2 μs and a time to half-value of 50 μs (at U oc = 6 kV). 

Follow-on Current I f 

The follow-on current flows through the SPD after the diverting 

process. It is supplied from the grid and differs fundamentally from 

the continuous operating current. 

Foundation Earthing Electrode 

The foundation earthing electrode is a conductor that is embedded 

into the concrete foundation of a construction. 

Gas-filled Surge Arrester (GDT) 

A gas-filled surge arrester is a discharge path filled with another gas 

than air, normally rare gas. 

Ground Resistance 

The ground resistance is the resistance between the earthing system 

and the reference earth. The amount of the ground resistance depends 

on the interaction of the individual earthing electrodes. 

Impulse Withstand Voltage U st 

The impulse withstand voltage is the peak value of the highest pulse 

voltage of a predefined waveform and polarity, which does not result 

in a breakdown under predefined test conditions. The impulse 

withstand voltage is equal to or higher as the rated impulse withstand 

voltage. 

Insertion Loss 

The insertion loss of an SPD is, at a given frequency, the ratio of the 

voltages at a supply network point immediately downstream to the 

SPD before and after the insertion of this SPD. The value is given in 

decibel. 




Insulation Resistance R iso 

The insulation resistance is the resistance of the surge arrester in the 

non-conductive state. 

Interference Suppression 

Interference suppression comprises all measures to abate or avoid 

electromagnetic interferences. 

Isolation Spark Gap 

The isolation spark gap is a spark gap to isolate conductive parts 

of an installation. When the spark gap is triggered by a lightning 

strike, the parts are temporarily conducted (lightning-protection 

equipotential bonding). 

Measured Limiting Voltage 

Maximum voltage that is measured at the terminals of an SPD while 

pulses with a preset form and amplitude are applied. 

Nominal Alternating Discharge Current I wn 

The nominal alternating discharge current is the alternating current 

with frequencies between 15 and 62 Hz (primarily 50 Hz), which the 

test object is dimensioned for in a specific test procedure. 

Nominal Impulse Discharge Current I n 

The nominal impulse discharge current is the peak value of a current 

with the waveform 8/20 that flows through a surge protection device. 

It is used to classify the test for class II surge protection devices. 

Lightning Current Arrester 

The lightning current arrester is a surge-voltage protection device 

which is capable of carrying direct lightning currents. 

Lightning Impulse Current Discharge (Lightning 

Impulse Current) 

The 10/350 μs lightning impulse current has a front time of 10 μs and 

a time to half-value of 350 μs. 

Nominal Load Current I L 

The nominal load current is the maximum continuous, alternating or 

direct current which can flow from the output of an SPD to the connected 

load. 

Nominal Voltage U N 

The nominal voltage, as a rounded voltage value, specified by the 

manufacturer of an electrical apparatus to identify it and to specify 

the voltage range for which it is designed. 

Lightning Impulse Current I imp 

The lightning impulse current Iimp is defined by its peak value I max , 

its charge Q and the specific energy W/R with a 10/350 μs waveform. 

The test is carried out according to the test procedure of the operation 

duty test. It is used to classify the test for class I surge protection 

devices. 

Lightning Protection Installation 

The lightning protection installation is the sum of all equipment for 

the external and internal lightning protection of the installation to 

be protected. 

Lightning Surge Voltage 

The lightning surge voltage is a surge voltage caused by a lightning 

discharge. 

Longitudinal Voltage Drop 

The longitudinal voltage drop is a means (instead of the insertion 

loss) to evaluate overvoltage arresters for dc voltages or low operating 

frequencies up to a maximum of 400 Hz. The longitudinal voltage 

drop is measured along the current path or paths at nominal 

current and, where applicable, operating frequency. 

Main Supply Short-Circuit Current I K 

The main supply short-circuit current is the short-circuit current 

which results from the impedance of the test network and the connecting 

cables at the installation point of the test object. 

Overvoltage Category 

The overvoltage category is the classification of a piece of electrical 

equipment to the expected overvoltages. 

Potential Equalization Conductor 

The potential equalization conductor is a conductive link to achieve 

potential equalization. 

Potential Equalization Installation 

The potential equalization installation is the total of all interconnected 

potential equalization conductors, including all other conductive 

parts which work in the same way, e.g. housings or other conductive 

installations. The potential equalization installation can either be the 

earth-termination system or part of it. 

Power-Frequency Withstand Voltage 

The power-frequency withstand voltage is the r.m.s. value of the 

highest sinusoidal voltage at system frequency, which does not result 

in a breakdown under predefined test conditions. 

Protection Level U p 

The protection level is a parameter which characterizes the performance 

of an SPD to limit the voltage between its terminals. The protection 

level is chosen from a list of standard values and has to exceed 

the highest value of the measured limiting voltages. 


9



Protection Path 

The parts of an SPD can be connected as “conductor against conductor” 

or “neutral conductor against earth”, or a combination of 

these possibilities. These methods of connection are called protection 

paths. 

Pulse 

A pulse is a rapid, temporary change of a physical parameter 

followed by a fast change back to the original value. 

Rate of Rise 

The rate of rise is the average change rate of a parameter between 

two certain values, e.g. between 10 % and 90 % of the peak value. 

Rated Voltage of an Arrester U c 

Maximum acceptable root-mean-square value of the power-frequency 

ac voltage that can be permanently applied to the terminals 

of the arrester. 

Reference Earth 

Reference earth is the reference ground (especially the earth’s surface) 

that is so far apart from the earthing electrodes that, if a current 

is diverted into the ground, no relevant voltage differences occur between 

the points of this area. 

Remote Signalling Contact 

Remote signalling contacts belong to a circuit which is separated 

from the main circuit of the SPD. The disconnection device of the 

SPD and/or an operation indication are part of the same circuit. 

Remote Strikes 

Remote strikes cause surges with a considerable smaller energy content 

compared to close-up strikes. 

Residual Current Protective Device (RCD) 

Residual current protective devices disconnect the circuit if the residual 

current against earth exceeds a certain value. 

Residual Voltage Ures 

The residual voltage is the peak value of the voltage that appears between 

the terminals of an SPD during the flow of a discharge current 

or immediately after it. 

Short-circuit Withstand Capability 

The short-circuit withstand capability is the highest unaffected 

short-circuit current the surge protection device can withstand. 

Single-port SPD 

A single-port SPD is connected in parallel to the circuit to be protected. 

A single-port SPD may have separate input and output terminals, 

although, without any series impedance between them. 

Sparkover Voltage 

The sparkover voltage is the highest instantaneous value of the voltage 

at the terminals of an arrester, just before it is triggered. 

Specialist in Lightning Protection 

A specialist in lightning protection has a professional training, knowledge 

and expertise as well as knowledge of the corresponding regulations 

that allow him to assess the work assigned to him as well 

as to identify possible dangers. (To judge the professional training, 

one can also consider several years of working in the corresponding 

field.) 

Status Display 

The status display indicates the state of operation of an SPD. 

Surge Voltage 

A surge voltage is a voltage that puts people and/or technical 

equipment like conductors and devices at risk. It can permanently 

(overvoltage) or temporarily (surge voltage) occur between conductor 

and earth in error-free installations (in disconnected conductors 

as well). 

Surge-voltage Protection Device (SPD) 

A surge-voltage protection device limits transient surges and diverts 

impulse currents. It includes at least one non-linear component. 

Temperature Range 

The temperature range describes the lowest and highest temperatures 

that are allowed at or inside the housing. For devices without 

self-heating this range refers to the ambient temperature. For devices 

with self-heating it indicates the maximum operating temperature 

range. 

TOV Characteristics 

The TOV characteristics describe the behavviour of an SPD to which 

a temporary overvoltage (TOV) is applied for a certain period of time. 

Transient (noun) 

A transient is a non-periodic and very short positive or negative 

change of voltage or current between two steady states. 

transient 

A transient behaviour describes the behaviour of a phenomenon or 

value which changes between two consecutive steady states in a 

very short time in comparison to the considered timescale. 

Transverse Voltage 

The transverse voltage is the interference voltage which occurs between 

two conductors of the same circuit. 

Triggering Current of the Disconnection Device 

The triggering current of the disconnection device is the root-meansquare 

value of the current through the arrester, which causes the 

disconnection device to operate within 30 seconds. 




Triggering 

Triggering is referred to, if either the peak value of the ohmic component 

of the current through the arrester reaches 5 mA or a voltage 

drop caused by the rise of the peak value of the current through the 

arrester exceeds 5 mA. 

Varistors 

A varistor is a bipolar non-linear resistor with symmetrical voltagecurrent 

characteristics. Its resistance decreases with increasing voltage. 

Withstand Voltage 

The withstand voltage is the maximum voltage that can be applied 

to a current-limiting component of an SPD without affecting it. This 

voltage can be equal to the highest continuous operating voltage 

Uc of the SPD or higher, depending on the components inside the 

SPD. 

100 % Lightning Impulse Sparkover Voltage 

The 100 % lightning impulse sparkover voltage is the voltage where 

the lightning impulse voltage 1.2/50 μs triggers the arrester. For some 

configurations, e.g. varistors, it is not possible to measure this value. 

Abbreviations 

CCP Cathodic Corrosion Protection 

CCPS Cathodic Corrosion Protection System 

EBS Equipotential Bonding Strip 

ESD Electrostatic Discharge 

FM Remote Signalling Contact (Changeover Contact) 

FS Fail-safe 

GDT Gas-Filled Surge Arrester 

LEMP Lightning Electromagnetic Impulse 

LPL Lightning Protection Level 

LPMS LEMP Protection Measures System 

LPS Lightning Protection System 

LPZ Lightning Protection Zone 

MBC Miniature Circuit Breaker 

MOV Metalloxyd Varistor 

PK Potential-free Contact (Break Contact) 

RCD Residual Current Device 

SEMP Switching Electromagnetic Pulse 

SEP Single Entry Point 

SPD Surge Protective Device 

SSCT Solderless and Screwless Connection Technology 

SVE Surge Voltage Protection Equipment 

SVP Surge Voltage Protector 

TAB Technical Connection Requirements for Electrical Power Installations 

TOV Temporary Overvoltage 

VDEW Vereinigung deutscher Elektrizitätswerke e.V. (German Association 

for the Power Supply Industry) 

VdS Verband der Sachversicherer (Property Insurer Association) 

Product Abbreviations 

DP DataPro 

EP EnerPro 

EPF EnerProFilter 

IP IsoPro 

IPD IsoProData 

PP PowerPro 

SP SumPro 


11

Notes 


Overvoltage Protection 

for Power Engineering 

Product Overview on Page 24 

13

Power Engineering 

Overview of SPD Wiring 

F1 

TN-S system 

type 1 (T1+T2+T3) 

L1 

L2 

L3 

N 

PE 

F2 

PAS 

TN-S system 

type 2 (T2) 

L1 

L2 

L3 

N 

PE 

F1 

F2 

PAS 

14 

Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de



TN-C system 

type 1 (T1+T2+T3) 

L1 

L2 

L3 

PEN 

F1 

F2 

PAS 

TN-C system 

type 2 (T2) 

L1 

L2 

L3 

PEN 

F1 

F2 

PAS 


15



TT system 

type 1 (T1+T2+T3) 

L1 

L2 

L3 

N 

F1 

L1 

L2 

L3 

N 

PE 

F2 

PAS 

F1 

TT system 

type 2 

L1 

L2 

L3 

N 

L1 

L2 

L3 

N 

PE 

F2 

L1 L2 L3 PE 

N 

16 




IT system 230 V ac 

type 1 (T1+T2) 


type 2 

L 

L 

F1 

L 

L 

PE 

L 

L 

F1 

L 

L 

PE 

F2 

F2 

PAS 

F1 


type 2 

L1 

L2 

L3 

L1 

L2 

L3 

PE 

F2 


17


Selection Guide: Surge Voltage Protection in Power Supply 

System 

Description 

Product examples 

3-phase power supply 

TN-S/TT 

TN-C 


separate N and PE 


common PEN 

single-phase power supply 

TN-S/TT 

TN-C 




common PEN 

3-phase 

IT 


without N 

singlephase 

IT 


without N 

Power supply for 

terminal equipment 

TN-S/TT 

3-phase 

TN-S/TT 

1-phase 

3-phase power supply for 

terminal equipment 

without N and PE 

single-phasige power supply 

for terminal equipment 




Product name 

Item no. 

Class I combined modular arrester 

Class II surge voltage arrester 

Class III surge voltage arrester 

Follow-on current extinguishing 

V-wiring 

Protection for terminal equipment 

Installation upstream to the meter 

Hermetically sealed spark gaps 

Visual fault/function indicator 

Function control indication via LED 

SPD and EMI filter 

Page 

PP BCD TNS 25/100 37 39 60 X X X X X X 28 

PP BCD TT 25/100 37 39 30 X X X X X X 29 

EP C S TNS 275 38 10 50 X X 89 

EP C S TT 275 38 10 40 X X 91 

PP BCD TNC 25/75 37 39 90 X X X X X X 27 

EP C S TNC 275 38 10 30 X X 88 

EP C TNC 275 38 11 76 X X 78 

PP BCD TN 25/50 38 12 14 X X X X X X 32 

EP C S TN 275 38 12 40 X X 87 

EP C TN 275 38 11 47 X X 77 

PP BCD TT1+1 25/100 38 11 34 X X X X X X 33 

EP C S TT1+1 275 38 10 24 X X 90 

EP C TT1+1 275 38 11 82 X X X 80 

IP BC 25 37 38 25 X X X 50 

EP C S T275 38 12 70 X X 98 

PP BCD TT 25/100 37 39 30 X X X X X X 29 

3 x EP C S T 550 38 13 10 X X 99 

PP BCD TT 2+ 1 25/100 37 39 34 X X X X X X 30 

2 x EP C S T 550 38 13 10 X X 99 

EP D T NS 275 38 05 30 X X X 107 

EP D TT 275 38 05 35 X X X 110 

EP D TN 275 38 12 54 X X X 105 

EP D TT1+1 275 38 05 38 X X X 108 

EPF 230V/16A 25 30 16 X X X X 152 


19


Quick Selection of Products 

Product Version Rated voltage 

U c 

Discharge Cap. 

I imp (10/350) 

Protectionlevel 

U p 

Follow-on current 

exting. cap. I fi 

Remote 

contact 

Max. back-up 

fuse A gl/gG 

Class I combined modular arrester ( T1+T2+T3 ), follow-on current extinguishing capability 

PP BCD TNC 25/75 3-pole 255 V 75 kA < 1.0 kV 4 kA 250 6 MW 37 39 90 27 

PP BCD TNC 25/75/FM 3-pole 255 V 75 kA < 1.0 kV 4 kA 3 NC 250 6 MW 37 39 92 27 

PP BCD TNC 25/75-350 3-pole 350 V 75 kA < 1.0 kV 4 kA 250 6 MW 38 50 00 27 

PP BCD TNC 25/75/FM-350 3-pole 350 V 75 kA < 1.0 kV 4 kA 3 NC 250 6 MW 38 50 10 27 

PP BCD TNS 25/100 4-pole 255 V 100 kA < 1.0 kV 4 kA 250 8 MW 37 39 60 28 

PP BCD TNS 25/100/FM 4-pole 255 V 100 kA < 1.0 kV 4 kA 4 NC 250 8 MW 37 39 62 28 

PP BCD TNS 25/100-350 4-pole 350 V 100 kA < 1.0 kV 4 kA 250 8 MW 38 50 20 28 

PP BCD TNS 25/100/FM-350 4-pole 350 V 100 kA < 1.0 kV 4 kA 4 NC 250 8 MW 38 50 30 28 

PP BCD TT 25/100 4-pole 255 V 100 kA < 1.0 kV 4 kA 250 8 MW 37 39 30 29 

PP BCD TT 25/100/FM 4-pole 255 V 100 kA < 1.0 kV 4 kA 3 NC 250 8 MW 37 39 32 29 

PP BCD TT 25/100-350 4-pole 350 V 100 kA < 1.0 kV 4 kA 250 8 MW 38 50 40 29 

PP BCD TT 25/100/FM-350 4-pole 350 V 100 kA < 1.0 kV 4 kA 3 NC 250 8 MW 38 50 50 29 

PP BCD TT2+1 25/100 3-pole 255 V 100 kA < 1.0 kV 4 kA 250 6 MW 37 39 34 30 

PP BCD TT2+1 25/100/FM 3-pole 255 V 100 kA < 1.0 kV 4 kA 2 NC 250 6 MW 37 39 36 30 

Class I combined modular arrester ( T1+T2 ), follow-on current extinguishing capability 

PP BC TNC 25/75 3-pole 255 V 75 kA < 2.5 kV 4 kA 160 6 MW 37 39 80 37 

PP BC TNC 25/75/FM 3-pole 255 V 75 kA < 2.5 kV 4 kA 3 NC 160 6 MW 37 39 82 37 

PP BC TNC 25/75-350 3-pole 350 V 75 kA < 2.5 kV 4 kA 160 6 MW 38 51 20 37 

PP BC TNC 25/75/FM-350 3-pole 350 V 75 kA < 2.5 kV 4 kA 3 NC 160 6 MW 38 51 30 37 

PP BC TNC 440 3-pole 440 V 75 kA < 2.5 kV 4 kA 160 6 MW 37 39 81 38 

PP BC TNC 440/FM 3-pole 440 V 75 kA < 2.5 kV 4 kA 3 NC 160 6 MW 37 39 83 38 

PP BC TNS 25/100 4-pole 255 V 100 kA < 2.5 kV 4 kA 160 8 MW 37 39 50 39 

PP BC TNS 25/100/FM 4-pole 255 V 100 kA < 2.5 kV 4 kA 4 NC 160 8 MW 37 39 52 39 

PP BC TNS 25/100-350 4-pole 350 V 100 kA < 2.5 kV 4 kA 160 8 MW 38 51 40 39 

PP BC TNS 25/100/FM-350 4-pole 350 V 100 kA < 2.5 kV 4 kA 4 NC 160 8 MW 38 51 50 39 

PP BC TT 25/100 4-pole 255 V 100 kA < 2.5 kV 4 kA 160 8 MW 37 39 20 40 

PP BC TT 25/100/FM 4-pole 255 V 100 kA < 2.5 kV 4 kA 3 NC 160 8 MW 37 39 22 40 

PP BC TT 25/100-350 4-pole 255 V 100 kA < 2.5 kV 4 kA 160 8 MW 38 51 60 40 

PP BC TT 25/100/FM-350 4-pole 255 V 100 kA < 2.5 kV 4 kA 3 NC 160 8 MW 38 51 70 40 

Class I combined modular arrester ( T1+T2 ), No follow-on current extinguishing capability 

IP BC TNC 25/75 3-pole 255 V 75 kA < 2.5 kV 160 6 MW 38 12 18 46 

IP BC TNC 25/75/FM 3-pole 255 V 75 kA < 2.5 kV 3 NC 160 6 MW 38 12 19 46 

IP BC TNC 25/75-350 3-pole 350 V 75 kA < 2.5 kV 160 6 MW 38 53 00 46 

IP BC TNC 25/75/FM-350 3-pole 350 V 75 kA < 2.5 kV 3 NC 160 6 MW 38 53 10 46 

IP BC TNS 25/75 4-pole 255 V 100 kA < 2.5 kV 160 8 MW 38 12 22 47 

IP BC TNS 25/75/FM 4-pole 255 V 100 kA < 2.5 kV 4 NC 160 8 MW 38 12 23 47 

IP BC TNS 25/75-350 4-pole 350 V 100 kA < 2.5 kV 160 8 MW 38 53 40 47 

IP BC TNS 25/75/FM-350 4-pole 350 V 100 kA < 2.5 kV 4 NC 160 8 MW 38 53 50 47 

IP BC TT 25/75 4-pole 255 V 100 kA < 2.5 kV 160 8 MW 38 12 26 48 

IP BC TT 25/75/FM 4-pole 255 V 100 kA < 2.5 kV 3 NC 160 8 MW 38 12 27 48 

IP BC TT 25/75-350 4-pole 350 V 100 kA < 2.5 kV 160 8 MW 38 53 80 48 

IP BC TT 25/75/FM-350 4-pole 350 V 100 kA < 2.5 kV 3 NC 160 8 MW 38 53 90 48 

Compact class I combined modular arrester ( T1+T2 ), No follow-on current extinguishing capability 

IPK BC TNC 275 3-pole 255 V 15 kA < 2.5 kV 160 5 MW 38 11 70 56 

IPK BC TNC 275/FM 3-pole 255 V 15 kA < 2.5 kV 3 NC 160 5 MW 38 11 71 56 

IPK BC TNC 350 3-pole 350 V 15 kA < 2.5 kV 160 5 MW 38 54 80 56 

Constr. 

width 

Item no. 

Page 




U c 

Discharge Cap. 

I imp (10/350) 


U p 

Follow-on current 

exting. cap. I fi 

Remote 

contact 

Max. back-up 

fuse A gl/gG 

IPK BC TNC 350/FM 3-pole 350 V 15 kA < 2.5 kV 3 NC 160 5 MW 38 54 90 56 

IPK BC TNS 275 4-pole 255 V 20 kA < 2.5 kV 160 5 MW 38 11 72 57 

IPK BC TNS 275/FM 4-pole 255 V 20 kA < 2.5 kV 4 NC 160 5 MW 38 11 73 57 

IPK BC TNS 350 4-pole 350 V 20 kA < 2.5 kV 160 5 MW 38 55 00 57 

IPK BC TNS 350/FM 4-pole 350 V 20 kA < 2.5 kV 4 NC 160 5 MW 38 55 10 57 

IPK BC TT 275 4-pole 255 V 20 kA < 2.5 kV 160 5 MW 38 11 74 58 

IPK BC TT 275/FM 4-pole 255 V 20 kA < 2.5 kV 3 NC 160 5 MW 38 11 75 58 

IPK BC TT 350 4-pole 350 V 20 kA < 2.5 kV 160 5 MW 38 55 20 58 

IPK BC TT 350/FM 4-pole 350 V 20 kA < 2.5 kV 3 NC 160 5 MW 38 55 30 58 

Class I lightning current arrester ( T1 ), follow-on current extinguishing capability 

PP B TNC 50/100 3-pole 255 V 75 kA < 4.0 kV 4 kA 250 6 MW 37 39 70 60 

PP B TNC 50/100/FM 3-pole 255 V 75 kA < 4.0 kV 4 kA 3 NC 250 6 MW 37 39 72 60 

PP B TNC 50/100-350 3-pole 350 V 75 kA < 4.0 kV 4 kA 250 6 MW 37 41 10 60 

PP B TNC 50/100-350/FM 3-pole 350 V 75 kA < 4.0 kV 4 kA 3 NC 250 6 MW 37 41 15 60 

PP B TNC 440 3-pole 440 V 75 kA < 4.0 kV 4 kA 250 6 MW 37 39 64 61 

PP B TNC 440/FM 3-pole 440 V 75 kA < 4.0 kV 4 kA 3 NC 250 6 MW 37 39 65 61 

PP B TNS 50/100 4-pole 255 V 100 kA < 4.0 kV 4 kA 250 8 MW 37 39 40 62 

PP B TNS 50/100/FM 4-pole 255 V 100 kA < 4.0 kV 4 kA 4 NC 250 8 MW 37 39 42 62 

PP B TNS 50/100-350 4-pole 350 V 100 kA < 4.0 kV 4 kA 250 8 MW 37 41 20 62 

PP B TNS 50/100-350/FM 4-pole 350 V 100 kA < 4.0 kV 4 kA 4 NC 250 8 MW 37 41 25 62 

PP B TNS 440 4-pole 440 V 100 kA < 4.0 kV 4 kA 250 8 MW 37 39 43 63 

PP B TNS 440/FM 4-pole 440 V 100 kA < 4.0 kV 4 kA 4 NC 250 8 MW 37 39 44 63 

PP B TT 50/100 4-pole 255 V 100 kA < 4.0 kV 4 kA 250 8 MW 37 39 10 65 

PP B TT 50/100/FM 4-pole 255 V 100 kA < 4.0 kV 4 kA 3 NC 250 8 MW 37 39 12 65 

PP B TT 50/100-350 4-pole 350 V 100 kA < 4.0 kV 4 kA 250 8 MW 37 41 30 65 

PP B TT 50/100-350/FM 4-pole 350 V 100 kA < 4.0 kV 4 kA 3 NC 250 8 MW 37 41 35 65 

Class I lightning current arrester ( T1 ) No follow-on current extinguishing capability 

IP B TNC 25/75 3-pole 255 V 75 kA < 4.0 kV 160 6 MW 38 12 16 70 

IP B TNC 25/75 /FM 3-pole 255 V 75 kA < 4.0 kV 3 NC 160 6 MW 38 12 17 70 

IP B TNS 25/100 4-pole 255 V 100 kA < 4.0 kV 160 8 MW 38 12 20 71 

IP B TNS 25/100 /FM 4-pole 255 V 100 kA < 4.0 kV 4 NC 160 8 MW 38 12 21 71 

IP B TT 25/100 4-pole 255 V 100 kA < 4.0 kV 160 8 MW 38 12 24 72 

IP B TT 25/100 /FM 4-pole 255 V 100 kA < 4.0 kV 3 NC 160 8 MW 38 12 25 72 

Constr. 

width 

Item no. 

Page 


U c 

Class II surge voltage arrester 

Nom. discharge 

current I n (8/20) 


U p 

Max. discharge 

curr. I max (8/20) 

Remote 

contact 

Max. back-up 

fuse A gl/gG 

EP C S TN 275 2-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 2 MW 38 12 40 87 

EP C S TN 275/FM 2-pole, separable 275 V 20 kA 1.2 kV 40 kA 1 NC 125 2 MW 38 12 41 87 

EP C S TN 350 2-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 2 MW 38 56 20 87 

EP C S TN 350/FM 2-pole, separable 350 V 20 kA 1.2 kV 40 kA 1 NC 125 2 MW 38 56 30 87 

EP C S TNC 275 3-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 3 MW 38 10 30 88 

EP C S TNC 275/FM 3-pole, separable 275 V 20 kA 1.2 kV 40 kA 1 NC 125 3 MW 38 10 35 88 

EP C S TNC 350 3-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 3 MW 38 56 40 88 

EP C S TNC 350/FM 3-pole, separable 350 V 20 kA 1.2 kV 40 kA 1 NC 125 3 MW 38 56 50 88 

EP C S TNS 275 4-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 4 MW 38 10 50 89 

EP C S TNS 275/FM 4-pole, separable 275 V 20 kA 1.2 kV 40 kA 1 NC 125 4 MW 38 10 55 89 

EP C S TNS 350 4-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 4 MW 38 56 60 89 

Constr. 

width 

Item no. 

Page 


21


Quick Selection of Products 

Product Version Rated voltage Nom. discharge Protectionlevel 

Max. discharge Max. back-up Remote Constr. Item no. Page 

U c 


U p curr. I max (8/20) fuse A gl/gG contact width 

EP C S TNS 350/FM 4-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 1 changeovr 4 MW 38 56 70 89 

EP C S TT1+1 275 2-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 2 MW 38 10 24 90 

EP C S TT1+1 275/FM 2-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 1 changeovr 2 MW 38 10 25 90 

EP C S TT1+1 350 2-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 2 MW 38 56 80 90 

EP C S TT1+1 350/FM 2-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 1 changeovr 2 MW 38 56 90 90 

EP C S TT 275 4-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 4 MW 38 10 40 91 

EP C S TT 275/FM 4-pole, separable 275 V 20 kA 1.2 kV 40 kA 125 1 changeovr 4 MW 38 10 45 91 

EP C S TT 350 4-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 4 MW 38 57 00 91 

EP C S TT 350/FM 4-pole, separable 350 V 20 kA 1.2 kV 40 kA 125 1 changeovr 4 MW 38 57 10 91 

EP C S T 75 1-pole, separable 75 V 10 kA < 400 V 25 kA 125 1 MW 38 12 60 98 

EP C S T 75/FM 1-pole, separable 75 V 10 kA < 400 V 25 KA 125 1 changeovr 1 MW 38 12 65 99 

EP C S T 130 1-pole, separable 130 V 15 kA < 600 V 40 kA 125 1 MW 38 12 45 98 

EP C S T 130/FM 1-pole, separable 130 V 15 kA < 600 V 40 kA 125 1 changeovr 1 MW 38 12 50 99 

EP C S T 275 1-pole, separable 275 V 20 kA < 1.2 kV 40 kA 125 1 MW 38 12 70 98 

EP C S T 275/FM 1-pole, separable 275 V 20 kA < 1.2 KV 40 kA 125 1 changeovr 1 MW 38 12 75 99 

EP C S T 440 1-pole, separable 440 V 15 kA < 2.0 KV 40 kA 125 1 MW 38 13 00 98 





EP C S T 550/FM 1-pole, separable 550 V 15 kA < 2.5 kV 40 kA 125 1 changeovr 1 MW 38 13 15 99 

SP C S NPE 1-pole, separable 275 V 20 kA 12 kA (10/350) 1 MW 38 12 46 

SP C S NPE/FM 1-pole, separable 275 V 20 KA 12 kA (10/350) 1 changeovr 1 MW 38 12 58 

Class II surge voltage arrester, leakage-current free 

EP C S TN 275 A 2-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 2 MW 38 09 28 94 

EP C S TN 275 A/FM 2-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 1 NC 2 MW 38 09 29 94 

EP C S TNC 275 A 3-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 3 MW 38 09 30 94 

EP C S TN 275 A/FM 3-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 1 NC 3 MW 38 09 31 94 

EP C S TNS 275 A 4-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 4 MW 38 09 32 96 

EP C S TNS 275 A/FM 4-pole, separable 275 V 20 kA < 1.2 kV 25 kA 100 1 NC 4 MW 38 09 33 96 

Class II surge voltage arrester, leakage-current free 

EP C TN 275 2-pole 275 V 15 kA 40 kA 100 2 MW 38 12 47 77 

EP C TN 275/FM 2-pole 275 V 15 kA 40 kA 100 1 NC 2 MW 38 12 48 77 

EP C TN 350 2-pole 350 V 15 kA 40 kA 100 2 MW 38 55 40 77 

EP C TN 350/FM 2-pole 350 V 15 kA 40 kA 100 1 NC 2 MW 38 55 50 77 

EP C TNC 275 3-pole 275 V 15 kA 40 kA 100 3 MW 38 11 76 78 

EP C TNC 275/FM 3-pole 275 V 15 kA 40 kA 100 1 NC 3 MW 38 11 77 78 

EP C TNC 350 3-pole 350 V 15 kA 40 kA 100 3 MW 38 55 60 78 

EP C TNC 350/FM 3-pole 350 V 15 kA 40 kA 100 1 NC 3 MW 38 55 70 78 

EP C TNS 275 4-pole 275 V 15 kA 40 kA 100 4 MW 38 11 78 79 

EP C TNS 275/FM 4-pole 275 V 15 kA 40 kA 100 1 NC 4 MW 38 11 79 79 

EP C TNS 350 4-pole 350 V 15 kA 40 kA 100 4 MW 38 55 80 79 

EP C TNS 350/FM 4-pole 350 V 15 kA 40 kA 100 1 NC 4 MW 38 55 90 79 

EP C TT1+1 275 2-pole 275 V 15 kA 40 kA 100 2 MW 38 11 82 80 

EP C TT1+1 275/FM 2-pole 275 V 15 kA 40 kA 100 1 NC 2 MW 38 11 83 80 

EP C TT1+1 350 2-pole 350 V 15 kA 40 kA 100 2 MW 38 11 88 80 

EP C TT1+1 350/FM 2-pole 350 V 15 kA 40 kA 100 1 NC 2 MW 38 11 91 80 



Product Version Rated voltage Nom. discharge Protectionlevel 

Max. discharge Max. back-up Remote Constr. Item no. Page 

U c 


U p curr. I max (8/20) fuse A gl/gG contact width 

EP C TT 275 4-pole 275 V 15 kA 40 kA 100 4 MW 38 11 80 81 

EP C TT 275/FM 4-pole 275 V 15 kA 40 kA 100 1 changeovr 4 MW 38 11 81 81 

EP C TT 350 4-pole 350 V 15 kA 40 kA 100 4 MW 38 56 00 81 

EP C TT 350/FM 4-pole 350 V 15 kA 40 kA 100 1 changeovr 4 MW 38 56 10 81 

Class III surge voltage arrester, mounting rail modules 

EP D TN 275 2-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 MW 38 12 54 105 

EP D TN 275/FM 2-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 1 MW 38 12 55 105 

EP D TNC 275 3-pole 275 V 5 kA < 1.0 kV 8 kA 16 3 MW 38 05 24 106 

EP D TNC 275/FM 3-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 3 MW 38 05 25 106 

EP D TNS 275 4-pole 275 V 5 kA < 1.0 kV 8 kA 16 4 MW 38 05 30 107 

EP D TNS 275/FM 4-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 4 MW 38 05 31 107 

EP D TT1+1 275 2-pole 275 V 5 kA < 1.0 kV 8 kA 16 2 MW 38 05 38 108 

EP D TT1+1 275/FM 2-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 2 MW 38 05 39 108 

EP D TT2+1 275 3-pole 275 V 5 kA < 1.0 kV 8 kA 16 3 MW 38 05 40 109 

EP D TT2+1 275/FM 3-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 3 MW 38 05 41 109 

EP D TT 275 4-pole 275 V 5 kA < 1.0 kV 8 kA 16 4 MW 38 05 35 110 

EP D TT 275/FM 4-pole 275 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 4 MW 38 05 36 110 

Class III surge voltage arrester, mounting rail modules 

EP D TN 24V/16A 2-pole 30 V 5 kA < 1.0 kV 8 kA 16 2 MW 38 05 50 112 

EP D TN 24V/16A/FM 2-pole 30 V 5 kA < 1.0 kV 8 kA 16 1 changeovr 2 MW 38 05 51 112 









Class III surge voltage arrester, adapter and flush-mounting versions 

EnerPro 220 Zw adapter plug/socket 220 V 5 kA < 1.2 kV 16 60 00 22 114 

CPS 230 Fax/Tel adapter plug/socket 230 V 5 kA 0.9 kV 10 kA 16 32 50 10 113 

CPS 230 ISDN adapter plug/socket 230 V 5 kA 0.9 kV 10 kA 16 32 50 20 113 

CPS 230 Network adapter plug/socket 230 V 5 kA 0.9 kV 10 kA 16 32 50 30 113 

CPS 230 SAT adapter plug/socket 230 V 5 kA 0.9 kV 10 kA 16 32 50 40 113 

NM 220V/5kA flush-mounting 230 V 5 kA < 1.0 kV 8 kA 16 36 05 22 117 

EnerPro 230 SDU flush-mounting 230 V 2, 5 kA < 1.5 kV 5 kA 16 24 00 02 118 

NM 220V/20kA flush-mounting 230 V 20 kA < 1.4 kV 20 kA 16 optionally 36 20 22 120 

EP D 230SM flush-mounting 230 V 2.5 kA < 950 V 6 kA 16 36 20 30 115 

SPD with EMI filter 

EPF 230V/25A-Tr DIN rail 25 kA 25 A 230 V 25 30 17 152 

EnerPro 24V-Tr DIN rail 20 kA 6 A 24 V 24 24 00 150 

EPF 60V/16A-S wall mounting 2-pole 25 kA 16 A 60 V 25 30 22 153 

EPF 230V/16A-W wall mounting 2-pole 25 kA 16 A 230 V 25 30 25 153 

EPF 230/400/35A-W wall mounting 4-pole 25 kA 35 A 230/400 V 25 31 00 154 

EPF 230/400/63A-E flush-mounting 4-pole 25 kA 63 A 230/400 V 25 31 30 155 




23


Product Overview 

Class I+II+III (T1+T2+T3) Combined Arresters 

Class I+III (T1+T2) Combined Arresters 

Class I (T1) Lightning Current Arresters 

Class II (T2) Surge Arresters, leakage-current free 

Class II (T2) Surge Arresters, pluggable 

Class III (T3) Surge Arresters, leakage-current free 

Class II+III (T2+T3) Surge Arresters 

PowerPro BCD, TN-C, TN-S and TT Systems...............................................25 

PowerPro BCD, 2-pole..............................................................................................31 

PowerPro BC, TN-C, TN-S and TT Systems...................................................35 

PowerPro BC, 2-pole..................................................................................................41 

IsoPro BC, TN-C, TN-S and TT Systems...........................................................44 

IsoPro BC, 1-pole......................................................................................................... 49 

IsoPro BC, 2-pole..........................................................................................................51 

IsoPro Kompakt BC, TN-C, TN-S and TT Systems.....................................54 

PowerPro B, TN-C, TN-S, TN, TT and IT Systems........................................59 

IsoPro B, TN-C, TN-S and TT Systems..............................................................69 

IsoPro B, 2-pole............................................................................................................ 73 

EnerPro C, TN-C, TN-S and TT Systems..........................................................76 

EnerPro 280Tr............................................................................................................... 84 

EnerPro C S, TN-C, TN-S and TT Systems..................................................... 86 

EnerPro C S A................................................................................................................92 

EnerPro C S T.................................................................................................................97 

EnerPro C S T A..........................................................................................................100 

Protective Modules for EnerPro C S..............................................................102 

EnerPro D TN-,, TN-C, TN-S and TT Systems.............................................104 

EnerPro D, TN, 24 V up to 230 V/16 A...............................................................111 

Class III (T3) Surge Arresters, diverse ............................................................. 113 

Arresters for Cathodic Corrosion Protection Systems 

Arresters for Photovoltaic Installations 

DC Power Supply 

Arresters with EMI Filter up to 200 A 

Equipment Protection with Increased Discharge Capacity...........119 

Pipeline Protection (Introduction)................................................................. 124 

Total Package of Pipeline Protection (Application)............................. 125 

Pipeline Protection (Products).........................................................................126 

Protection of PV Installations (Introduction)........................................... 133 

Complete Protection of PV Installations....................................................138 

Protection of PV Installations (Products)...................................................139 

............................................................................................................................................. 147 

EnerPro Filters (EPF).................................................................................................151 

Housings 

Insulating Enclosures.............................................................................................156 

Aluminium Enclosures..........................................................................................159 

Accessories .............................................................................................................................................160 




PowerPro BCD, TN-C, TN-S and TT Systems 

• All-in-one modular protection unit, ready for connection 

• Rare-gas-filled spark gap, hermetically sealed 

• Discharge capacity up to 100 kA (10/350 µs) 

• High quenching of follow-on short-circuit currents 

• High insulation resistance 

• V-wiring with multi-functional terminals 

• Maximum operational availability 

• Protection level from < 0.75 kV up to 1.0 kV 

• High TOV resistance 

• No blow-out vents, thus, not requiring any safety 

clearance to other installations 

• No leakage currents, thus, allowing installation 

upstream of power meters 

• Optional remote signalling contact (FM) requiring no 

additional space 

• Operates independently of atmospheric air pressure 

and ambient humidity 

Multi-pole combined modular arresters for the protection 

of low-voltage consumers’ installations in business and residential 

areas against surges caused by lightning or switching 

actions in the network. 

The installation place of the PowerPro BCD is the main distribution 

board upstream or downstream of the power meter. 

According to the lightning protection zones concept in IEC 

DIN EN 62305 part 1-4 (VDE 0185-305-1-4), it can universally be 

installed at the transition 0 A to 2. 

Due to their good insulation against earth of ≥ 10 GΩ and 

the fact that no leakage-current affected varistors (MOV) 

are connected in parallel, they even can be placed upstream 

of the meter according to the specifications of the German 

VDN (TAB 2007). 

Downstream equipment should additionally be protected by 

Leutron class III or class II+III SPDs. They are coordinated with 

the PowerPro BCD in a way that they can be installed without 

the need of a minimum distance. 

The rare-gas-filled combined modular arresters of the series 

PowerPro BCD reduce follow-on short-circuit currents 

to such an extend that a 35 A fuse would not operate and 

upstream positioned surge-current protection devices are 

not triggered. 

These SPDs of the series PowerPro BCD feature a high thermal 

resistance and a discharge capability for lightning impulse 

currents of 25 kA (10/350 µs) per pole. Therefore, they 

can confidentially be applied at all protection levels according 

to DIN EN 62305 (VDE 0185-305). 

The modular designed, multi-pole complete units are available 

for TN, TN-C, TN-S, TN-C-S and TT systems according to 

IEC (EN, VDE, OEVE, etc.) standards. They are shipped readyto-connect 

(on rail). They are also available for IT networks 

in country-specific versions with or without neutral conductor 

(N). 

Combined modular arresters of the series BCD offer a higher 

insulation level and lower investment and installation costs, 

due to their low voltage protection level of less than 1 kV at 

full discharge current. They are able to divert high lightning 

impulse currents and operate also at small, transient surges 

under different ambient conditions, reliably and without any 

problems. 

Even at a load of 3 to 5 kA the residual voltage remains below 

650 V! 

Due to the application of the gas discharge technology the 

PowerPro BCD SPDs are resistant against temporary and long 

lasting overvoltages (TOV) up to 400 V (50 Hz). 

Leutron also offers a special version with a higher operating 

voltage. The units can universally be installed at all export 

countries with nominal system voltages of 200 to 260 V. 

The TT system version discharges the impulse current between 

L and N. Between N and PE a Leutron summation current 

spark gap SumPro with 100 kA (10/350µs) will be applied 

which corresponds to the highest lightning protection class 

I according to VDE 0185-305 (IEC DIN EN 62305). 

With back-up fuses or circuit-breakers of more than 250 A, a 

selective back-up fuse (fusible cutout) of max. 250 A has to 

be installed to avoid an overload of the IsoPro caused by a 

high short-circuit current. 

The pre-assembled, two-pole busbars at the terminals allow 

a serial V-wiring of the SPD to a back-up fuse up to 125 A. 


25



In the case of single-pole units the individual SPD modules 

can optionally be delivered with integrated, non-resetable 

thermal sensors (/FM) or (/Pk). 

This remote state display for the individual SPD modules 

makes a periodical maintenance unneccessary. 

This way, with a minimum of additional acquisition costs the 

maintenance costs can be reduced considerably. 

The sensors are already triggered before a possible damage 

of the SPD module, which then has to be replaced for security 

reasons. 

At an overload of the SPD the sensors open a hermeticallysealed, 

potential-free remote contact permanently. 

The remote contacts have to be included in the order of the 

SPD. Retrofitting is not possible. 

The remote signalling contact (FM or Pk) is connected via a 

twisted-pair cable to an integrated plug-type terminal block 

of the SPD. 

The latching hooks per pole on both sides of the SPD allow 

for an installation on a 35 mm DIN rail, even under difficult 

mounting conditions inside the distributor. 

For a supply from below, the labels can be reversed and the 

front plate can be turned through 180°. On demand, a second, 

self-adhesive front plate can be delivered as a replacement, 

free of charge. 





PowerPro BCD TNC 

Combined modular multi-pole arrester for 3-phase TN-C systems. 

• Optional remote signalling contact (FM) 

L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PEN 

11 12 

PEN 

11 12 

PEN 

11 12 

Basic circuit diagram 

Technical Data PP BCD TNC 25/75 PP BCD TNC 25/75-350 

Nominal alternating voltage (UN) 230/400 V~ 230/400 V~ 

Max. continuous operating alternating voltage (Uc) 255 V~ 350 V~ 

Insulation resistance (Risol) >10 GΩ >10 GΩ 

Protection level at 100% lightn. imp. sparkover voltage (1.2/50 µs) (Uas) ≤ 1.0 kV ≤ 1.0 kV 

Protection level at Iimp [L-PE] (Up) ≤ 1.0 kV ≤ 1.0 kV 

Response time (tA)




PowerPro BCD TNS 

Combined modular multi-pole arrester for 3-phase TN-S systems. 


L1 L1' L2 L2' L3 L3' 

N 

N' 

Patented 

Patented 

Patented 

Patented 

n 

n 

n 

n 

PE 

11 12 

PE 

11 12 

PE 

11 12 

PE 

11 12 


Technical Data PP BCD TNS 25/100 PP BCD TNS 25/100-350 






Response time (tA)




PowerPro BCD TT 

Combined modular multi-pole arrester for 3-phase TT and TN-S systems. 

• 4-pole; 3+1 N-PE 


L1 L1' L2 L2' L3 L3' 

PE 

PE' 

Patented 

Patented 

Patented 

n 

n 

n 

11 12 

11 12 

11 12 

11 12 

N N N N 

Technical Data PP BCD TT 25/100 PP BCD TT 25/100-350 





Protection level at Iimp [L-N] (Up) ≤ 1.0 kV ≤ 1.0 kV 

Response time (tA)




PowerPro BCD TT2+1 

Combined modular multi-pole arrester for 2-phase TT systems. 


L1 L1' L2 L2' 

PE 

PE' 

Patented 

Patented 

n 

n 

11 12 

11 12 

11 12 

N N N 


Technical Data PP BCD TT2+1 25/100 

Nominal alternating voltage (UN) 230/400 V~ 

Max. continuous operating alternating voltage (Uc) 255 V~ 

Insulation resistance (Risol) 

>10 GΩ 

Protection level at 100% lightn. imp. sparkover voltage (1.2/50 µs) (Uas) ≤ 1.0 kV 

Protection level at Iimp (10/350 µs) [L-N] (Up) 

≤ 1.0 kV 

Response time (tA) 

< 50 ns 

Lightning impulse current (10/350 µs) [L1+L2+N-PE] (Itotal) 

100 kA 

Lightning impulse current (10/350 µs) [L-N] Iimp 

25 kA 

Lightning impulse current (10/350 µs) [N-PE] Iimp 

100 kA 

Follow-on current extinguishing capability at Uc (50/60 Hz) (Ifi) 4 kA 

Nominal discharge current (8/20 µs) (In) 

100 kA 

Short-circuit withstand capability at max. back-up fuse (Ik) 

50 kA 

Max. acceptable fuse or back-up fuse F2 (spur wiring) 

250 A gL/gG A 

Max. acceptable fuse or back-up fuse F1 (V-wiring) 

125 A gL/gG A 

Operating temperature range (TU) -40 – +80 °C 

Max. conductor cross section 

50 mm² stranded / 35 mm² fine-stranded 

Recommended conductor cross section 

25 mm² 

Max. connection torque for terminals 

4.5 Nm 

Enclosure material / colour 

polycarbonate (halogen-free) UL94-V0 / yellow 

Degree of protection (IEC EN 60529) IP 20 

Order Data 

Product PP BCD TT2+1 25/100 

Ordering part no. 37 39 34 

Technical Data and Order Data 

PP BCD TT2+1 25/100/FM 

FM contact / contact type 

break contact 

Switching capacity 

250 V/2 A 

Product 

PP BCD TT2+1 25/100/FM 


30 




PowerPro BCD, 2-pole 









• Protection level from < 0.75 kV up to 1.0 kV 









Two-pole combined arrester for the protection of low-voltage 

consumers’ installations in industry, business and residential 

areas against transient surges caused by lightning (LEMP) or 

switching actions in the network (SEMP). 

The TT system version discharges impulse currents between L 

and N. Between N and PE a Leutron summation current spark 

gap SumPro with 100 kA (10/350µs) will be applied which corresponds 

to the highest lightning protection class I according 

to VDE 0185-305 (IEC DIN EN 62305). 

The arresters can be installed at the transition 0 A to 2 according 

to the lightning protection zones concept. 

There are special models available with an integrated control 

indication via LED for the conductor and the arrester function. 

All technical data and dimensions correspond to those 

of the standard version. 


31




PowerPro BCD TN 

Combined modular multi-pole arrester for 1-phase TN systems. 


L L' N N' 

Patented 

Patented 

n 

n 

PE 

11 12 

PE 

11 12 


Technical Data PP BCD TN 25/50 PP BCD TN 25/50-350 






Response time (tA) < 50 ns < 50 ns 

Lightning impulse current (10/350 µs) [L+N-PE] (Itotal) 50 kA 50 kA 

Lightning impulse current (10/350 µs) [L,N-PE] Iimp 25 kA 25 kA 

Follow-on current extinguishing capability at Uc (50/60 Hz) (Ifi) 4 kA 4 kA 

Short-circuit withstand capability at max. back-up fuse 250 A gL (Ik) 50 kAeff 50 kAeff 

Max. acceptable fuse or back-up fuse F2 (spur wiring) 250 A gL/gG A 250 A gL/gG A 

Max. acceptable fuse or back-up fuse F1 (V-wiring) 125 A gL/gG A 125 A gL/gG A 

Operating temperature range (TU) -40 – +80 °C -40 – +80 °C 

Max. conductor cross section 50 mm² stranded / 35 mm² fine-stranded 50 mm² stranded / 35 mm² fine-stranded 

Recommended conductor cross section 25 mm² 25 mm² 

Max. connection torque for terminals 4.5 Nm 4.5 Nm 

Enclosure material / colour polycarbonate (halogen-free) UL94-V0 / yellow polycarbonate (halogen-free) UL94-V0 / yellow 

Degree of protection (IEC EN 60529) IP 20 IP 20 

Mounting on 35 mm DIN rail (DIN EN 50 022) 35 mm DIN rail (DIN EN 50 022) 

Net weight / pc 510 g 480 g 

Order Data 

Product PP BCD TN 25/50 PP BCD TN 25/50-350 

Ordering part no. 38 12 14 38 50 60 

Technical Data and Order Data PP BCD TN 25/50/FM PP BCD TN 25/50/FM-350 

FM contact / contact type break contact break contact 

Switching capacity 250 V/2 A 250 V/2 A 

Product PP BCD TN 25/50/FM PP BCD TN 25/50/FM-350 


32 





PowerPro BCD TT1+1 



L 

L' 

PE 

PE' 

Patented 

n 

N 

11 12 

11 12 

N 


Technical Data PP BCD TT1+1 25/100 PP BCD TT1+1 25/100-350 






Response time (tA)




PowerPro BCD TN/LED 


• With two green LED (operation). 


L L' N N' 

Patented 

Patented 

n 

n 

PE 

11 12 

PE 

11 12 


Technical Data PP BCD TN 25/50/LED PP BCD TN 25/50/LED-350 



Insulation resistance (Risol) > 10 GΩ >10 GΩ 



Response time (tA) < 50 ns


Class I+II (T1+T2) Combined Arresters 

PowerPro BC, TN-C, TN-S and TT Systems 

• All-in-one modular protection unit, ready for 

connection 



• High quenching capacity of follow-on short-circuit 

currents 



• Protection level ≤ 2,5 kV 













The arresters can be installed at the transition 0 A to 2 

according to the lightning protection zones concept. 

The SPDs are leakage current-free and protect the earthing 

system against dangerous ac-caused corrosion. 

Due to their good insulation against earth of ≥ 10 GΩ and 

the fact that no leakage-current affected varistors (MOV) 

are connected in parallel, they even can be placed upstream 


VDN (TAB 2007). 

These SPDs of the series PowerPro BC feature a high thermal 

resistance and a discharge capability for lightning impulse 

currents of 25 kA (10/350 µs) per pole. Therefore, they can 

confidentially be applied at all protection levels according 

to DIN EN 62305 (VDE 0185-305). 


for TN, TN-C, TN-S, TN-C-S, and TT systems according to 




(N). 




















This remote state display for the individual SPD modules 

makes a periodical maintenance unneccessary. 



reasons. 







of the SPD. 





35







Combined modular arresters of the series BC offer a higher 

insulation level due to their low voltage protection level of 

less than 2.5 kV at full discharge current and less than 2 kV 

at 5 kA respectively. They are able to divert high lightning 


under different ambient conditions, reliably and without 

any problems. 


PowerPro BC SPDs are resistant against temporary and long 



PowerPro BC significantly reduce possible follow-on shortcircuit 

currents due to an extremely quick quenching after 

equipotential bonding and due to their integrated extinction 

chamber. Therefore, upstream positioned surge-current 

protection devices are not triggered. 

The installation place of the PowerPro BC is the main distribution 

board upstream or downstream of the power meter. According 

to the lightning protection zones concept in IEC DIN 

EN 62305 part 1-4 (VDE 0185-305-1-4), it can universally be installed 

at the transition 0 A to 2. 

Downstream equipment should additionally be protected by 

Leutron class III or class II+III SPDs. They are coordinated with 

the PowerPro BCD in a way that they can be installed without 

the need of a minimum distance. 

Due to the height of the standard housing of 90 mm, the 

SPDs can easily be placed together with upstream installed 

surge-current protection devices and circuit-breakers for 

equipment (MCB or RCD) of the same height on rails in distribution 

boxes with 45 mm cutout, and they can be connected 

with busbars. 





PowerPro BC TNC 



L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PEN 

11 12 

PEN 

11 12 

PEN 

11 12 


Technical Data PP BC TNC 25/75 PP BC TNC 25/75-350 



Insulation resistance (Risol) >10 GΩ > 10 GΩ 



Response time (tA)




PowerPro BC TNC 440 

Combined modular multi-pole arrester for 3-phase TN-C systems with 

400/690 V. 


L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PEN 

11 12 

PEN 

11 12 

PEN 

11 12 


Technical Data PP BC TNC 440 




>10 GΩ 


Protection level at Iimp (10/350 µs) [L-PE] (Up) 

≤ 2.0 kV 





PowerPro BC TNS 



L1 L1' L2 L2' L3 L3' 

N 

N' 

Patented 

Patented 

Patented 

Patented 

n 

n 

n 

n 

PE 

11 12 

PE 

11 12 

PE 

11 12 

PE 

11 12 


Technical Data PP BC TNS 25/100 PP BC TNS 25/100-350 






Response time (tA)




PowerPro BC TT 



L1 L1' L2 L2' L3 L3' 

PE 

PE' 

Patented 

Patented 

Patented 

n 

n 

n 

11 12 

11 12 

11 12 

11 12 

N N N N 


Technical Data PP BC TT 25/100 PP BC TT 25/100-350 

Nominal alternating voltage (UN) 230/400 V~ 230 / 400 or 240 / 415 V~ 

Max. continuous operating alternating voltage (Uc) 255 (275) V~ 350 V~ 




Response time (tA)



PowerPro BC, 2-pole 




• Extinction of the follow-on short-circuit current up to 4 A 


• Protection level ≤ 2,5 kV 



















insulation level due to their low voltage protection level of 

less than 2.5 kV at full discharge current and less than 2 kV 

at 5 kA respectively. They are able to divert high lightning 


under different ambient conditions, reliably and without any 

problems. 

Due to the application of the gas discharge technology, the 

PowerPro BC SPDs are resistant against temporary and long 



PowerPro BC significantly reduce possible follow-on shortcircuit 


equipotential bonding and due to their integrated extinction 

chamber. Therefore, upstream positioned surge-current protection 

devices are not triggered. 





All downstream class II+III (T2+T3) SPDs are energetically 

compatible with the PP BC. 

The typical installation place of the PowerPro BC is the main 

distribution board upstream or downstream of the power 

meter. According to the lightning protection zones concept 

in IEC DIN EN 62305 part 1-4 (VDE 0185-305-1-4), it can universally 

be installed at the transition 0 A to 2. 

In 230 V ac networks the optional potential-free remote contact 

(FM) can be updated by an additional acoustic/optical 

signalling device UAS 230-Tr with test key (Item no. 35 10 30), 

even at a later point in time. 




41




PowerPro BC TN 



L L' N N' 

Patented 

Patented 

n 

n 

PE 

11 12 

PE 

11 12 


Technical Data PP BC TN 25/50 PP BC TN 25/50-350 






Response time (tA)




PowerPro BC TT1+1 



L 

L' 

PE 

PE' 

Patented 

n 

N 

11 12 

11 12 

N 


Technical Data PP BC TT1+1 25/100 PP BC TT1+1 25/100-350 





Protection level at Iimp [L-N](Up) ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)



IsoPro BC, TN-C, TN-S and TT Systems 

• Completely mounted on busbar, ready-to-connect 



• Protection level ≤ 2 kV 


• On the basis of hermetically sealed rare-gas-filled 

spark gaps 







Multi-pole combined modular arresters for the protection of 

low-voltage consumers’ installations in industrial, business 

and residential areas against surges caused by lightning or 

switching actions in the network. 



The series IsoPro (IP) is based on a well-proved technology. 

Per pole two selectively responding protection stages are 

placed in a combined DIN housing (2 MW of only 35 mm). The 

leakage current-free protective circuit consists of a varistor 

(MOV) and a gas-filled surge arrester (GDT) connected in series. 

In addition, a rare-gas-filled, hermetically sealed highperformance 

isolating spark gap from industrial ceramics 

– resistant against pressure and high temperatures – is connected 

in parallel. 

The IsoPro BC combined modular arrester is available with a 

discharge capability of 25 kA and 60 kA (10/350 µs) per pole, 

or at TT systems with 100 kA (10/350µs) between N and PE. 


IsoPro BC SPDs are resistant against temporary and long lasting 

overvoltages (TOV) up to 500 V (50 Hz). 

Therefore, the SPDs of the series IsoPro can confidentially 

be applied at all protection levels according to DIN EN 62305 

(VDE 0185-305). 

This SPD has a redundant function. In case of a (theoretically 

possible) malfunction of the first protection stage the robust 

and overload-resistant main spark gap remains in operation 

and guarantees the coarse protection of the network. 

High-energy lightning impulse currents cause the main spark 

gap to fire, thus, protecting the first protection stage (MOV 

and GDT) against thermal overload. 

Only the first protection stage responds during occurring 

transient surges of low energy. The main spark gap will not 

fire. Due to the limiting behaviour of the MOV varistor the response 

of the first protection stage will not result in a short 

circuit and, therefore, in no follow-on short-circuit current. 

The back-up fuse will not actuate in this case. 

The main spark gap extinguishes follow-on short-circuit currents 

only under certain conditions. If a maximum operational 

availability is desired, a back-up fuse of ≤ 160 A is necessary 

to extinguish a firing main spark gap and, thus, preventing 

it from thermal damage. In most cases a back-up fuse will 

be installed in industrial applications and for maintenance 

reasons, whereby the power supply will not be interrupted 

even if the SPD fails. 

Lightning impulse currents with a high energy content cause 

the main spark gap to fire immediately after the triggering 

of the first protection stage. Hence, the main spark gap with 

its discharge capacity unloads the first stage and protects it 

against damage. 

With back-up fuses or circuit-breakers of more than 160 A a 

selective back-up fuse (fusible cutout) of a maximum of 160 A 

has to be installed to avoid an overload of the IsoPro caused 

by a high short-circuit current. 



due to their low residual voltage. They are able to divert high 

lightning impulse currents and operate also at small, transient 




surges under different ambient conditions without any additional 

trigger – reliably and without any problems. 

The SPDs are leakage-current free and protect the earthing 


Due to their good insulation against earth of 10 GΩ and the 

fact that no leakage-current affected varistors (MOV) are 

connected in parallel, they even can be placed upstream 


VDN (TAB 2007). 




(on rail). 


















reasons. 





of the SPD. 









45




IsoPro BC TNC 


• 3-pole 


L1 

L1' L2 

L2' L3 L3' 

PEN 11 12 PEN 11 12 PEN 11 12 


Technical Data IP BC TNC 60/100 IP BC TNC 60/100-350 IP BC TNC 25/75 IP BC TNC 25/75-350 

Nominal alternating voltage (UN) 230/400 V~ 230/400 (250/440) V~ 230/400 V~ 230/400 V~ 

Max. continuous operating alternating voltage (Uc) 255 V~ 350 V~ 255 V~ 350 V~ 

Insulation resistance (Risol) >10 GΩ > 10 GΩ >10 GΩ >10 GΩ 

Protection level at 100% lightn. imp. sparkover voltage (1.2/50 µs) (Uas) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Protection level at Iimp (10/350 µs) (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)




IsoPro BC TNS 


• 4-pole 


L1 

L1' L2 

L2' L3 L3' 

N 

N' 

PE 11 12 PE 11 12 PE 11 12 

PE 11 12 


Technical Data IP BC TNS 60/100 IP BC TNS 60/100-350 IP BC TNS 25/100 IP BC TNS 25/100-350 

Nominal alternating voltage (UN) 230/400 V~ 230/400 V~ 230/400 V~ 230/400 V~ 


Insulation resistance (Risol) >10 GΩ >10 GΩ >10 GΩ > 10 GΩ 


Protection level at Iimp (10/350 µs) [L-PE] (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)




IsoPro BC TT 


• 4-pole; 3+1 NPE 


L1 

L1' L2 

L2' L3 L3' 

PE 

'PE 

N 11 12 N 11 12 N 11 12 

N 11 12 


Technical Data IP BC TT 60/100 IB BC TT 60/100-350 IP BC TT 25/100 IP BC TT 25/100-350 

Nominal alternating voltage (UN) 230/400 V~ 230/400 – 240/415 V~ 230/400 V~ 230/400 V~ 




Protection level at Iimp (10/350 µs) [L-N] (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)



IsoPro BC, single-pole 

• Discharge capacity up to 60 kA (10/350µs) per pole 

• Protection level = 2 kV 



spark gaps 





Single-pole modular all-purpose combined arrester for the 

protection of low-voltage consumers’ installations in industry, 

business and residential areas against transient surges 

caused by switching actions or lightning. 

The arresters can be installed at the transition 0 A to 2 


The single-pole IsoPro BC series is subdivided into the following 

performance groups and voltage protection levels: 

• 25 kA and 60 kA (10/350 µs) and is classified as 

• class I+II (T1+T2) combined SPD (former category B+C) 

with a voltage protection level of 2 kV or < 2,5 kV. 

Single-pole IsoPro units can be combined with the help of a 

multi-pole PE or N (at TT systems) busbar connector to multi-pole 

protective devices for TN, TN-C, TN-S and TT systems. 

However, for an application in TT systems a summation-current 

spark-gap module Leutron SumPro B or BC (100 kA 10/350 

µs) has to be added between N and PE. 

The optional thermal remote alarm contact (Pk) is designed as 

a hermetically-sealed floating break contact (NC) for security 

reasons. In case of a thermal overload of the SPD the contact 

opens permanently. The Pk function has to be included in the 

order of the SPD. Retrofitting is not possible. 







All other features of the single-pole combined arresters correspond 

to those of the multi-pole version. 


49



IsoPro BC, single-pole 

IsoPro BC 

Single-pole combined arrester. 


L/N 

PE 11 12 


Technical Data IP BC 25 IP BC 60 





Protection level at Iimp (10/350 µs) / 5 kA (10/350 µs) [L-PE] (Up) ≤ 2.5 / ≤ 2 kV ≤ 2.5 / ≤ 2 kV 

Response time (tA)



IsoPro BC, 2-pole 

• All-in-one modular protection unit, ready for 

connection 

• Discharge capacity up to 100 kA (10/350µs) 







spark gaps 









The arresters can be installed at the transition 0A to 2 


The single-phase (2-pole) IsoPro series is subdivided into the 

following performance groups and voltage protection levels: 

• 25 kA and 60 kA (10/350 µs) per active conductor or, at TT 

systems, between N and PE 100 kA (10/350 µs), and between 

the active conductors and PE or N, therefore in 

total: 50 kA or 100 kA. 

• It is classified as class I+II (T1+T2) SPD (former category 

B+C) with a voltage protection level of 2 kV or < 2,5 kV 

depending on the impulse current load. 

All other features correspond to those of the multi-pole combined 

arresters. 


51




IsoPro BC TN 



L 

L' 

N 

N' 

PE 11 12 PE 11 12 


Technical Data IP BC TN 60/100 IP BC TN 60/100-350 IP BC TN 25/50 IP BC TN 25/50-350 





Protection level at Iimp (10/350 µs) [L-PE] (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)




IsoPro BC TT1+1 



L 

L' 

PE 

PE' 

N 

11 12 

N 

11 12 


Technical Data IP BC TT1+1 60/100 IP BC TT1+1 60/100-350 IP BC TT1+1 25/100 IP BC TT1+1 25/100-350 





Protection level at Iimp (10/350 µs) [L-N] (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV 

Response time (tA)



IsoPro Kompakt BC, TN-C, TN-S and TT Systems 



• Optical function control display by LED 



spark gaps 





• Complete optical monitoring of conductor and 

arrester by LED 







The series IsoPro Kompakt (IPK) is based on a well-proved 

technology. Per pole two selectively responding protection 

stages with LED monitoring are placed in a combined DIN 

housing that is only 88 mm wide. The leakage current-free 

protective circuit consists of a varistor (MOV) and a gas-filled 

surge arrester (GDT) connected in series. In addition, a raregas-filled, 

hermetically sealed high-performance isolating 

spark gap from industrial ceramics – resistant against pressure 

and high temperatures – is connected in parallel. 







VDN (TAB 2007). 

The multi-pole complete units in compact housings are available 

for TN-C, TN-S, TN-C-S and TT systems as well as for threephase 

systems according to IEC (EN, VDE, OEVE, etc.) standards. 

They are shipped ready-to-connect. 

The proper function of every single protection stage of the 

IsoPro Kompakt (IPK) is indicated by two green LEDs at the 

housing. If one LED fails the SPD remains partly functional. If 

the second LED fails the protection is not working any longer 

and the SPD has to be replaced. 

Optionally, the IsoPro Kompakt can be delivered with integrated, 

non-resetable thermal sensors (FM). At an overload 

of the SPD the sensors open a hermetically-sealed, potentialfree 

remote contact permanently. This remote state display in 

addition to the local optical LED indicator makes a periodical 

maintenance unneccessary. 


of the SPD. The SPD then has to be replaced for security 

reasons. 





The remote signalling contact is connected via a twisted-pair 

cable to an integrated plug-type terminal block of the SPD. 





High-energy lightning impulse currents cause the main spark 

gap to fire, thus, protecting the first protection stage (MOV 

and GDT) against thermal overload. 

Due to the application of the gas discharge technology in 

both protection stages, the IsoPro SPDs are resistant against 

temporary and long lasting overvoltages (TOV) up to 500 V 

(50 Hz). 










The main spark gap extinguishes follow-on short-circuit currents 

only under certain conditions. If a maximum operational 

availability is desired, a back-up fuse of ≤ 160 A is necessary 

to extinguish a firing main spark gap and, thus, preventing 

it from thermal damage. In most cases a back-up fuse will 

be installed in industrial applications and for maintenance 

reasons, whereby the power supply will not be interrupted 

even if the SPD fails. 
















due to their low residual voltage. They are able to divert high 

lightning impulse currents and operate also at small, transient 

surges under different ambient conditions without any additional 

trigger – reliably and without any problems. 


55




IsoPro Kompakt BC TNC 

Combined modular and compact multi-pole arrester for 3-phase TN-C systems. 


L1 

L2 

L3 

q 

q 

q 

q 

q 

q 

q q q 

PEN 

PEN 

11 FM 12 


Technical Data IPK BC TNC 275 IBK BC TNC 350 




Protection level Iimp (8/80 µs) [L-PE] (Up) ≤ 2.5 kV ≤ 2.5 kV 


Response time (tA)




IsoPro Kompakt BC TNS 

Combined modular and compact multi-pole arrester for 3-phase TN-S systems. 


L1 

L2 

L3 

N 

q 

q 

FM FM FM FM 

q 

q 

q 

q 

q 

q 

q q q 

q 

PE 

PE 

11 FM 12 


Technical Data IPK BC TNS 275 IBK BC TNS 350 



Protection level at 100% lightn. imp. sparkover voltage (1.2/50 µs) (Uas) ≤ 1.4 kV 10 GΩ 

Response time (tA)




IsoPro Kompakt BC TT 

Combined modular and compact multi-pole arrester for 3-phase TT and TN-S 

systems. 


L1 

L2 

L3 

PE 

q 

q 

FM 

FM 

q 

q 

q 

q 

q q q 

N 

N 

11 FM 12 


Technical Data IPK BC TT 275 IPK BC TT 350 




Protection level Iimp (8/80 µs) [L-N] (Up) ≤ 2.5 kV ≤ 2.5 kV 


Response time (tA)



PowerPro B TN-C, TN-S, TN, TT and IT Systems 






• Protection level up to 4 kV 












Multi-pole lightning current arrester for the protection of lowvoltage 

consumers’ installations in business and residential 

areas against surges caused by lightning or switching actions 

in the network. 



The series PowerPro B (PP B) has the following performance 

features: 50 kA (10/350 µs) per pole and 100 kA (10/350 µs) between 

N and PE in TT systems respectively. It is classified as 

class I (T1) SPD (former category B) with a voltage protection 

level of 4 kV between L and PE (or N in TT systems) depending 

on the impulse current load. 

The SPDs of the series PowerPro B feature a high thermal resistance 

and an outstanding discharge capability for lightning 

impulse currents of 50 kA (10/350 µs) per pole. Therefore, 

they can be applied according to DIN EN 62305 (VDE 

0185-305). 


PowerPro B significantly reduce possible follow-on shortcircuit 


equipotential bonding. Therefore, upstream positioned 

surge-current protection devices are not triggered. 







VDN (TAB 2007). 






(N). 




















of the SPD. 





59




PowerPro B TNC 

Modular multi-pole lightning current arrester for 3-phase TN-C systems. 


L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PEN 

11 12 

PEN 

11 12 

PEN 

11 12 


Technical Data PP B TNC 50/100 PP B TNC 50/100-350 






Response time (tA)




PowerPro B TNC 440 

Modular multi-pole lightning current arrester for 3-phase TN-C systems with 

440/690 V. 


L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PEN 

11 12 

PEN 

11 12 

PEN 

11 12 


Technical Data PP B TNC 440 




>10 GΩ 



≤ 4.0 kV 





PowerPro B TNS 

Modular multi-pole lightning current arrester for 3-phase TN-S systems. 


L1 L1' L2 L2' L3 L3' 

N 

N' 

Patented 

Patented 

Patented 

Patented 

n 

n 

n 

n 

PE 

11 12 

PE 

11 12 

PE 

11 12 

PE 

11 12 


Technical Data PP B TNS 50/100 PP B TNS 50/100-350 






Response time (tA)




PowerPro B TNS 440 

Modular multi-pole lightning current arrester for 3-phase TN-S systems with 

400/690 V. 


L1 L1' L2 L2' L3 L3' 

N 

N' 

Patented 

Patented 

Patented 

Patented 

n 

n 

n 

n 

PE 

11 12 

PE 

11 12 

PE 

11 12 

PE 

11 12 


Technical Data PP B TNS 440 




>10 GΩ 


Protection level at Iimp [L-PE] (Up) 

≤ 4.0 kV 





PowerPro B TN 

Modular multi-pole lightning current arrester for 1-phase TN systems. 


L L' N N' 

Patented 

Patented 

n 

n 

PE 

11 12 

PE 

11 12 


Technical Data PP B TN 50/100 




>10 GΩ 


Protection level at Iimp [L-PE] (Up) 

≤ 4.0 kV 





PowerPro B TT 

Modular multi-pole lightning current arrester for 3-phase TT and TN-S systems. 


L1 L1' L2 L2' L3 L3' 

PE 

PE' 

Patented 

Patented 

Patented 

n 

n 

n 

11 12 

11 12 

11 12 

N N N N 

Technical Data PP B TT 50/100 PP B TT 50/100-350 






Response time (tA)




PowerPro B TT1+1 

Modular multi-pole lightning current arrester for 1-phase TT systems. 


L 

L' 

PE 

PE' 

Patented 

n 

N 

11 12 

11 12 

N 


Technical Data PP B TT1+1 50/100 




>10 GΩ 


Protection level at Iimp [L-N] Up) 

≤ 4.0 kV 





PowerPro B TT2+1 



L1 L1' L2 L2' 

PE 

PE' 

Patented 

Patented 

n 

n 

11 12 

11 12 

11 12 

N N N 


Technical Data PP B TT2+1 50/100 

Nominal alternating voltage (UN) 100/200 bzw. 110/220 V~ 

Max. continuous operating alternating voltage (Uc) >255 V~ 


>10 GΩ 

Protection level at 100% lightn. imp. sparkover voltage (1.2/50 µs) (Uas)




PowerPro B IT 

Modular multi-pole lightning current arrester for 3-phase IT systems. 


L1 L1' L2 L2' L3 L3' 

Patented 

Patented 

Patented 

n 

n 

n 

PE 

11 12 

PE 

11 12 

PE 

11 12 


Technical Data PP B IT 50/100 


Max. continuous operating alternating voltage (Uc) >440 V~ 


>10 GΩ 



≤ 4.0 kV 




IsoPro B, TN-C, TN-S and TT Systems 







• Protection level up to 4 kV 










Multi-pole lightning current arrester for the protection of 

low-voltage consumers’ installations in industry, business and 

residential areas against surges caused by lightning or switching 

actions in the network. The arresters can be installed at 

the transition 0 A to 1 according to the lightning protection 

zones concept. 


system against dangerous ac-caused corrosion. Due to their 

good insulation against earth of ≥ 10 GΩ and the fact that no 

leakage-current affected varistors (MOV) are connected in 

parallel, they even can be placed upstream of the meter according 

to the specifications of the German VDN (TAB 2007). 

The lightning current arresters offer an insulation protection 

according to codes and standards due to their maximum residual 

voltage of less than 4 kV. They are very robust and can 

divert lightning currents up to 60 kA (10/350 µs). They operate 

under different ambient conditions without any additional 

trigger – reliably and without any problems. Due to the application 

of the gas discharge technology the IsoPro B SPDs 

are resistant against temporary and long lasting overvoltages 

(TOV) up to 500 V (50 Hz). The modular designed, multi-pole 

complete units are available for TN, TN-C, TN-S, TN-C-S, and 

TT systems according to IEC (EN, VDE, OEVE, etc.) standards. 

They are shipped ready-to-connect (on rail). Leutron also offers 

a special version with a higher operating voltage. The 

units can universally be installed at all export countries with 

nominal system voltages of 200 to 260 V. 






The pre-assembled, two-pole busbars at the terminals allow a 

serial V-wiring of the SPD to a back-up fuse up to 125 A. Even 

at high lightning impulse currents only a very small voltage 

drop can occur due to the very short conductor between the 

L and PE (N) terminal. Therefore, there is no influence on the 

residual voltage. In the case of single-pole units the individual 

SPD modules can optionally be delivered with integrated, 

non-resetable thermal sensors (/FM) or (/Pk). The remote 

signalling contact (FM or Pk) is connected via a twisted-pair 

cable to an integrated plug-type terminal block of the SPD. 

The latching hooks per pole on both sides of the SPD allow for 

an installation on a 35 mm DIN rail, even under difficult mounting 

conditions inside the distributor. For a supply from below, 

the labels can be reversed and the front plate can be turned 

through 180°. On demand, a second, self-adhesive front plate 

can be delivered as a replacement, free of charge. 

The series IsoPro B has the following performance features: 

• 25 A and 60 kA (10/350 µs) per pole and 100 kA (10/350 µs) 

between N and PE in TT systems respectively. It is classified 

as 

• class I (T1) SPD (former category B) with a voltage protection 

level of 4 kV between L and PE (or N in TT systems) 

depending on the impulse current load. 

The SPDs of the series IsoPro B feature a high thermal resistance 

and an outstanding discharge capability for lightning 

impulse currents of 25 respectively 60 kA (10/350 µs) per pole. 

Therefore, they can be applied according to DIN EN 62305 

(VDE 0185-305). 


69




IsoPro B TNC 

Modular multi-pole lightning current arrester for 3-phase TN-C systems. 


L1 

L1' L2 

L2' L3 L3' 

PEN 11 12 PEN 11 12 PEN 11 12 

Technical Data IP B TNC 60/100 IP B TNC 25/75 



Insulation resistance (Risol) > 10 GΩ >10 GΩ 


Protection level at Iimp (10/350 µs) [L-PE] (Up) ≤ 4.0 kV ≤ 4.0 kV 

Response time (tA)




IsoPro B TNS 

Modular multi-pole lightning current arrester for 3-phase TN-S systems. 


L1 

L1' L2 

L2' L3 L3' 

N 

N' 

PE 11 12 PE 11 12 PE 11 12 

PE 11 12 

Technical Data IP B TNS 60/100 IP B TNS 25/100 






Response time (tA)




IsoPro B TT 

Modular multi-pole lightning current arrester for 3-phase TT and TN-S systems. 


L1 

L1' L2 

L2' L3 L3' 

PE 

PE' 

N 

N N N 

11 12 11 12 11 12 

11 12 

Technical Data IP B TT 60/100 IP B TT 25/100 





Protection level at Iimp (10/350 µs) [L-N] (Up) ≤ 4.0 kV ≤ 4.0 kV 

Response time (tA)



IsoPro B, 2-pole 

















Two-pole lightning current arresters for the protection of 

low-voltage consumers’ installations in industry, business and 

residential areas against transient surges caused by switching 

actions or lightning. 



The single-phase (2-pole) IsoPro series is subdivided into the 

following performance groups and voltage protection levels: 

• 25 kA and 60 kA (10/350 µs) per active conductor or, at TT 

systems, between N and PE 100 kA (10/350 µs), and between 

the active conductors and PE or N, therefore in total: 

50 kA or 100 kA. 

• It is classified as class I (T1) SPD (former category B) with 

a voltage protection level of 4 kV depending on the impulse 

current load. 

The series IsoPro (IP) is based on a well-proved technology. 

Per pole two selectively responding protection stages are 

placed in a combined DIN housing (2 MW of only 35 mm). The 

leakage current-free protective circuit consists of a varistor 

(MOV) and a gas-filled surge arrester (GDT) connected in series. 

In addition, a rare-gas-filled, hermetically sealed highperformance 

isolating spark gap from industrial ceramics 

– resistant against pressure and high temperatures – is connected 

in parallel. 

Therefore, the SPDs of the series IsoPro can confidentially 

be applied at all protection levels according to DIN EN 62305 

(VDE 0185-305). 





In case of high-energy lightning impulse currents the main 

spark gap fires, thus, protecting the first protection stage 

(MOV and GDT) against thermal overload. 

Due to the application of the gas discharge technology in 

both protection stages, the IsoPro SPDs are resistant against 

temporary and long lasting overvoltages (TOV) up to 500 V 

(50 Hz). 

















73




IsoPro B TT1+1 



L 

L' 

PE 

PE' 

N 

11 12 

N 

11 12 


Technical Data IP B TT1+1 25/50 IP B TT1+1 60/100 





Protection level at Iimp (10/350 µs) [L-N] (Up) ≤ 4.0 kV ≤ 4.0 kV 

Response time (tA)




IsoPro B TN 

Modular multi-pole lightning current arrester for 1-phase TN systems. 


L 

L' 

N 

N' 

Technical Data IP B TN 60/100 IP B TN 25/50 

PE 11 12 PE 11 12 






Response time (tA)



EnerPro C, TN-C, TN-S and TT Systems 

• Monitoring of conductor and arrester via LED 

• With multi-functional terminals, max. 35 mm² 

• Compact housing, no contact problems with plug-in 

connections 

• Class II SPD on the basis of hermetically sealed raregas-filled 

spark gaps 

• Possible to coordinate with upstream installed 

Leutron lightning current arresters of classes I, I+II 

and I+II+III 

• Leakage-current free version to protect the foundation 

earthing electrode against ac-caused corrosion 



Multi-pole surge arresters for the protection of low-voltage 




The arresters can be installed at the transition 0 B to 1 and 

higher, according to the lightning protection zones concept. 

The multi-pole complete units in compact housings are available 

for TN-C, TN-S, TN-C-S and TT systems as well as for threephase 

systems according to IEC (EN, VDE, OEVE, etc.) standards. 

They are shipped ready-to-connect. 

With their leakage current-free design, TOV security and LED 

monitoring as well as their optional hermetically-sealed remote 

alarm contacts the arresters set new standards in terms 

of monitoring comfort, security, reliability and life expectancy. 

The arresters can be combined with upstream installed 

arresters of the series PowerPro and IsoPro. 

The SPD modules have thermal disconnection devices per 

pole, which respond if, due to an overload, the partial lightning 

current through the metal oxide varistor exceeds a certain 

value. In this case the green LED extinguishes and the optional 

thermal sensor with remote contact (normally closed) 

opens. In order to maintain the surge voltage protection the 

SPD has to be replaced immediately. 

The thermally triggered, potential-free remote alarm contact 

is a hermetically sealed switch to eliminate environmental 

influences and to guarantee the highest possible security. 

For security reasons it is designed as a normally closed contact 

(NC). 

The MOV and the expulsion-type spark gap are connected 

in series to avoid heating and, thus, ageing in the state of 

rest. Therefore, a considerable increase in life expectancy is 

reached. There is no need for expensive thermo sensors to 

monitor the surface temperature. Thus, the protection modules 

do not need to be pluggable 

The SPD is equipped with a reliable LED function display. 

The LED has a dual function as indicator for the varistor function 

and as voltage monitor. Therefore, a proper connection 

and function of the SPD is indicated during installation. Additionally, 

an extinguished LED during operation indicates a 

malfunction. 

Since this version is leakage current-free, the earthing system 

is protected against dangerous ac-caused corrosion and the 

earth leakage circuit-breaker will not be activated by leakage 

currents. 

Versions with additional gas-discharge spark gaps do not 

interfere with the function of permanently installed insulation 

monitoring devices and earth leakage circuit-breakers. 

The EP C units are also available with a rated voltage of 350 

V for a higher TOV resistance. 









EnerPro C TN 

Compact and leakage-current free 2-pole surge arrester, e.g. for a 1-phase 

TN system. 


• Monitoring of conductor and arrester 

L 

N 

q 

q 

q 

2 

Technical Data EP C TN 275 EP C TN 350 

Nominal alternating voltage (UN) 230/400 V~ 350 V~ 

Max. continuous operating alternating voltage (Uc) 275/480 V~ 275/480 V~ 

Max. acceptable fuse or back-up fuse 125 A gL/gG A 125 A gL/gG A 

Protection level at 5 kA (Up) ≤ 1.0 kV ≤ 1.3 kV 

Protection level at In (8/20 µs) (Up) ≤ 1.4 kV ≤ 1.75 kV 

Response time (tA)




EnerPro C TNC 


TN-C system. 



PEN 

Technical Data EP C TNC 275 EP C TNC 350 






Response time (tA)




EnerPro C TNS 


TN-S system. 



L1 

L2 

L3 

N 

4 

PE 

11 12 

FM 


Technical Data EP C TNS 275 EP C TNS 350 






Response time (tA)




EnerPro C TT1+1 

Compact and leakage-current free 2-pole surge arrester, e.g. for a 1-phase TT 

and TN system. 



L1 

PE 

Technical Data EP C TT1+1 275 EP C TT1+1 350 

N 11 12 

Nominal alternating voltage (UN) 230/400 V~ 230/400 (240/415) V~ 

Max. continuous operating alternating voltage (Uc) 275/480 V~ 350 V~ 



Protection level at In (Up) ≤ 1.4 kV ≤ 1.4 kV 

Response time (tA)




EnerPro C TT 

Compact and leakage-current free 4-pole surge arrester, e.g. for a 3-phase TT 

and TN-S system. 



L1 

L2 

L3 

PE 

3 

Technical Data EP C TT 275 EP C TT 350 

N 11 12 

Nominal alternating voltage (UN) 230/400 V~ 230/400 – 240/415 V~ 

Max. continuous operating alternating voltage (Uc) 275/480 V~ 350 V~ 



Protection level at In (Up) ≤ 1.4 kV ≤ 1.4 kV 

Response time (tA)




EnerPro C TN 275-D 

Compact and leakage-current free 2-pole surge arrester with looped-in wiring, 

e.g. for the protection of TN systems by applying only one module in the subdistribution 

board. 



Technical Data EP C TN 275-D 

Nominal alternating voltage (UN) 230 V~ 


Max. acceptable fuse or back-up fuse 

16 A gL/gG A 

Protection level at 5 kA (Up) 

≤ 1.0 kV 

Protection level at In (8/20 µs) (Up) 

≤ 1.4 kV 


< 50 ns 

Nominal discharge current (8/20 µs) (In) 

15 kA 

Max. impulse discharge current (8/20 µs) (Imax) 

40 kA 


Max. conductor cross section 

35 mm² stranded / 25 mm² fine-stranded 

Recommended conductor cross section 

16 mm² 

Max. connection torque for terminals 

4.5 Nm 



Degree of protection (IEC EN 60529) IP 20 

Mounting on 35 mm DIN rail (DIN EN 50 022) 

Net weight / pc 

320 g 

Order Data 

Product EP C TN 275-D 






EnerPro C TN 75 

Leakage-current free 2-pole surge arrester with LED indicator, e.g. for a 

TN system up to 75 V ac 



L 

N 

q 

q 

q 

2 

PE 

11 12 

FM 


Technical Data EP C TN 75 

Nominal alternating voltage (UN) 60 V~ 



125 A gL/gG A 


≤ 0.3 kV 

Protection level at In (8/20 µs) (Up) 

≤ 0.55 kV 




EnerPro 280Tr 

• Very space-saving installation! 

• Only 1 modular width instead of 2 

• Two-pole high performance surge protector for 

230/400 V 

• Function control indication via LED 

• 2+1 circuit 

The SPD modules have thermal disconnection devices per 

pole, which respond if, due to an overload, the partial lightning 

current through the metal oxide varistor exceeds a certain 

value. In this case the green LED extinguishes and the optional 

thermal sensor with remote contact (normally closed) 

opens. In order to maintain the surge voltage protection the 

SPD has immediately to be replaced. 

The thermally triggered, potential-free remote alarm contact 

is a hermetically sealed switch to eliminate environmental 

influences and to guarantee the highest possible security. 

For security reasons it is designed as a normally closed contact 

(NC). 

The MOV and the expulsion-type spark gap are connected 

in series to avoid heating and, thus, ageing in the state of 

rest. Therefore, a considerable increase in life expectancy is 

reached. Thus, the protection modules do not need to be 

pluggable. 

The SPD is equipped with a reliable LED function display in 

place of a mechanical display. 

The LED has a dual function as indicator for the varistor function 

and as voltage monitor. Therefore, a proper connection 

and function of the SPD is indicated during installation. Additionally, 

an extinguished LED during operation indicates a 

malfunction. 

The optional remote alarm contacts are placed in the housing. 

For the electrical connection twisted cables are attached 

to screw-type terminals at a terminal fixing of the SPD. 

Since this SPD version is leakage current-free, the earthing 

system is protected against dangerous ac-caused corrosion 

and the earth leakage circuit-breaker will not be activated 

by leakage currents. 

Versions with additional gas-discharge spark gaps do not 

interfere with the function of permanently installed insulation 

monitoring devices and earth leakage circuit-breakers. 

This compact SPD with a modular width of only 1 MW is designed 

for single-phase TN systems with backup fuses up to 

125 A. A single protection unit can protect two conductors 

(against PE or N) or one conductor and the neutral conductor 

(against PE). 

The arrester has only half the width of standard protective 

devices. 

The EnerPro 280Tr is equipped with a thermal disconnection 

device, which is triggered if due to an overload (high leakage 

currents) the varistor temperature rises too much. 

In this case the green function control indication extinguishes 

and the optional remote contact opens. In order to maintain 

the surge voltage protection the SPD has immediately 

to be replaced. 








EnerPro 280Tr 

EnerPro 280Tr 

Slim and Leakage-current free 2-pole surge arrester, e.g. for a 1-phase 

TN system. Only 1 MW according to DIN 43880. 

• Optional remote signalling contact (PK) 


Technical Data 

EnerPro 280Tr 


Max. continuous direct voltage (Uc) 

275/480 V 


125 A gL/gG A 


≤ 1.0 kV 

Protection level at In {L(N)-PE} (Urest) 

≤ 1.4 kV 


≤ 50 ns 

Nominal discharge current (8/20 µs) {L(N)-PE} (In) 

15 kA 

Critical discharge current (8/20 µs) (Imax) 

18 kA 




Casting compound 

polyurethane 

Mounting on 35 mm DIN rail (DIN EN 50 022) 

Net weight / pc 

110 g 


Order Data 

Product 

EnerPro 280Tr 


Technical Data and Order Data 

EnerPro 280Tr/Pk 

FM contact / contact type 

break contact 

Switching capacity 

250 V/2 A 

Product 

EnerPro 280Tr/Pk 



85



EnerPro C S, TN-C, TN-S and TT Systems 

• Multi-pole complete unit consisting of basic module 

and pluggable protective modules 

• Possible to coordinate with upstream installed 

Leutron lightning current arresters of classes I, I+II 

and I+II+III 

• With multi-function terminals for connecting 

• High discharge capacity due to powerful varistors 

• Optional remote signalling contact (FM), pre-wired in 

housing, requiring no additional space 

• Function indicator display via red/green indication in 

the vision panel 

The pluggable, multi-pole complete units are available for 

TN-C, TN-S, TN-C-S, TT systems and ac systems according to 

IEC (EN, VDE, OEVE, etc.) standards. They are shipped readyto-connect. 

Single-pole and multi-pole surge arrester for the protection 

of low-voltage consumers’ installations in industry, business 

and residential areas against transient surges. 

The arresters can be installed at the transition 0 B to 1 and 

higher, according to the lightning protection zones concept. 

They can be combined with upstream installed arresters of 

the series PowerPro and IsoPro. 

They consist of a multi-pole receptacle (basic module) and 

coded, pluggable surge-protection modules. 

The grounding bar, respectively the connection to the neutral 

conductor (N) in models for TT systems, is already implemented 

in the receptacle together with the terminals of the 

remote contact. 

The protective circuit per pole with its safety thermal disconnection 

mechanism is contained in a narrow (1 module width) 

plug-in module with an optical function control display. 

The pluggable protection modules of the series EP CS are 

equipped with an optical function control displays. 

The optional remote alarm contact (FM) which consists of 

a microswitch (changeover contact) is placed in a practical, 

multi-pole compact receptacle (basic module) which can be 

placed on a 35 mm DIN rail (form C). The electrical connection 

is achieved via screw-type terminals that are connected 

to a terminal fixing of the SPD. 

At the version for TT systems the receptacle will be inserted 

between L and N. An N-PE spark-gap module is plugged in 

between N and PE. 

The amply dimensioned terminals of the receptacle allow for 

a connection to circular conductors as well as busbar connectors 

or flat conductors. 

The EP C S units are also available with a rated voltage of 350 V 

ac for a higher TOV resistance. 

The varistors of the plug-in modules that are connected to 

the active conductor possess thermal disconnection devices, 

which respond if due to an overload the leakage current 

wich flows through the metal oxide varistor exceeds a certain 

value. In this case the LED display changes from GREEN 

to RED and the optional remote contact (changeover contact) 

switches. In this case, the plug-in modules have to be 

replaced immediately. 

As a spare part, a leakage current-free protection module 

of the series EP CS …A of the same rated voltage can be 

plugged into the receptacle of the series EP CS …(T) at a 

later point in time. 









EnerPro C S TN 

Pluggable 2-pole surge arrester, e.g. for 1-phase TN systems. 


Technical Data EP C S TN 275 EP C S TN 350 

Nominal alternating voltage (UN) 230 V~ 230 V~ 


Max. continuous direct voltage (Uc) 350 V 460 V 


Protection level at 5 kA (8/20 µs) (Uas) < 0.9 kV < 1.2 kV 

Protection level at In (8/20 µs) (Up) < 1.2 kV < 1.4 kV 

Response time (tA) ≤ 25 ns ≤ 25 ns 

Nominal discharge current (8/20 µs) (In) 20 kA 20 kA 

Max. impulse discharge current (8/20 µs) (Imax) 40 kA 40 kA 

Short-circuit withstand capability at max. back-up fuse, 50 Hz (Ik) 35 kA 25 kA 


Min./max. conductor cross section according to ISO single-wire 10/50, stranded and fine-stranded 10/35 mm² 10/25 mm² 

Conductor insulation stripping length 14 mm 14 mm 

Max. conductor cross section 50 stranded / 35 fine-stranded mm² 50 stranded / 35 fine-stranded mm² 


Max. connection torque for terminals 4 Nm 4 Nm 


Enclosure material / colour polyamide PA 6 30SV, UL94 VO / yellow polyamide PA 6 30SV, UL94 VO / yellow 



Order Data 

Product EP C S TN 275 EP C S TN 350 



Technical Data and Order Data EP C S TN 275/FM EP C S TN 350/FM 

FM contact / contact type changeover contact changeover contact 

Switching capacity ac: 250/0.5 dc: 250/0.1 V/A ac: 250/0.5 dc: 250/0.1 V/A 

Product EP C S TN 275/FM EP C S TN 350/FM 



87




EnerPro C S TNC 

Pluggable 3-pole surge arrester, e.g. for 3-phase TN-C systems. 


Technical Data EP C S TNC 275 EP C S TNC 350 




Max. acceptable fuse or back-up fuse 125 A gL/gG A 125 AgL/gG A 

Protection level at 5 kA (8/20 µs) (Uas) ≤ 0.9 kV ≤ 1.2 kV 















Order Data 

Product EP C S TNC 275 EP C S TNC 350 



Technical Data and Order Data EP C S TNC 275/FM EP C S TNC 350/FM 



Product EP C S TNC 275/FM EP C S TNC 350/FM 






EnerPro C S TNS 

Pluggable 4-pole surge arrester, e.g. for 3-phase TN-S systems. 


Technical Data EP C S TNS 275 EP C S TNS 350 





Protection level at 5 kA (8/20 µs) (Uas) ≤ 0.9 kV ≤ 1.2 kV 















Order Data 

Product EP C S TNS 275 EP C S TNS 350 



Technical Data and Order Data EP C S TNS 275/FM EP C S TNS 350/FM 



Product EP C S TNS 275/FM EP C S TNS 350/FM 



89

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