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Technical catalog for Susol & Metasol ACB
Technical catalog for Susol & Metasol ACB
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1. What is ZSI?
Zone-selective interlocking diminishes time-delay that cause problems for machines. It is used to minimize pressure
on all kinds of electric machineries under high-demanding conditions.
1) While short time-delay or ground fault accidents are happening at ZSI built-in system, the machinery at accident
sites is sending a signal through its lines to halt upperstream machinery’s operation.
2) Then to eliminate a breakdown, it activates its trip operation without any time delayed.
3) The upperstream machinery that received ZSI signal adhere to pre-set short time-delay or ground fault time-
delay for protective coordination in the system, however upperstream machinery that did not receive its signal
will trip instantaneously.
4) For ordinary ZSI operation, it should arrange operation time accordingly so that downstream circuit breakers
will react before upperstream ones under overcurrent/short time delay/ground fault situations.
5) ZSI connecting line is signal operation at TTL Level, therefore it needs to be formed within 3m.
6) ZSI output can be connected up to 12 lines (MAX) to ZSI input.
2. ZSI Configuration
ZSI Input
ZSI Output
ZSI Input
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