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Power Engineering Class I+II (T1+T2) Combined Arresters IsoPro BC, TN-C, TN-S and TT Systems IsoPro BC TT Combined modular multi-pole arrester for 3-phase TT and TN-S systems. • 4-pole; 3+1 NPE • Optional remote signalling contact (FM) L1 L1' L2 L2' L3 L3' PE 'PE N 11 12 N 11 12 N 11 12 N 11 12 Basic circuit diagram 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~ 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) [L-N] (Up) ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV ≤ 2.5 kV Response time (tA)
Power Engineering Class I+II (T1+T2) Combined Arresters IsoPro BC, single-pole • Discharge capacity up to 60 kA (10/350µs) per pole • Protection level = 2 kV • High insulation resistance • On the basis of hermetically sealed rare-gas-filled spark gaps • No blow-out vents, thus, not requiring any safety clearance to other installations • Optional remote signalling contact (FM) requiring no additional space 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 according to the lightning protection zones concept. 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. 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. 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. All other features of the single-pole combined arresters correspond to those of the multi-pole version. Leutron GmbH · Humboldtstrasse 30 · 70771 Leinfelden-Echterdingen · Germany · Phone +49 711 94771-0 · www.leutron.de 49
Page 3 and 4: Safety and Reliability Jörg Jelen
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