Part - Leutron GmbH

Power Engineering
Class II (T2) Surge Arresters, leakage-current free
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
• Optional remote signalling contact (FM) requiring no
additional space
Multi-pole surge arresters 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 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.
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.
76 Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de