Can a circuit breaker be used instead of an Isolator?
Can a circuit breaker be used instead of an Isolator?
(OP)
Is it Ok to use a 1250A circuit breaker incorporated in the PSU in lieu of an external Isolator(Heavy duty, 1250A) in isolating a power supply unit from a substation.
Also what is the airgap between the contacts of an Isolator and that of a circuit breaker too?
Also what is the airgap between the contacts of an Isolator and that of a circuit breaker too?






RE: Can a circuit breaker be used instead of an Isolator?
Regards
Marmite
RE: Can a circuit breaker be used instead of an Isolator?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Can a circuit breaker be used instead of an Isolator?
1. if you mean that is it enough to use the incorporated CB, or do you still have to buy an external unit, i think the answer is no you do not need to buy any more units and you can limit yourself to the CB on the PSU.
2. if you mean that a heavy duty isolator can replace a C.B. because it can open on full load and close on short circuit, then i think you cannot because after you close on a short circuit the isolator is toast unless there is a circuit breaker on the same line to interrupt this fault.
RE: Can a circuit breaker be used instead of an Isolator?
old field guy