MCCB Ics and Icu
MCCB Ics and Icu
(OP)
can anyone explain meaning of these Icu and Ics values?
what is the meaning of that Ics=100% of Icu?
how Icu and Ics differs for different voltages?
why Icu and Ics values defined for single phase voltages as well even though MCCB is a multi pole device which will always get voltage over 400V?

what is the meaning of that Ics=100% of Icu?
how Icu and Ics differs for different voltages?
why Icu and Ics values defined for single phase voltages as well even though MCCB is a multi pole device which will always get voltage over 400V?







RE: MCCB Ics and Icu
Icu - Rated ultimate short circuit breaking capacity
Ics - Rated service short circuit breaking capacity
I have attached an excerpt that goes into details.
RE: MCCB Ics and Icu
RE: MCCB Ics and Icu
The other value occasionally seen is Icw which is the withstand value for a through fault without the breaker operating - this value is found on ACBs rather than MCCBs.