Circuit breakers: 3ph VS 1ph
Circuit breakers: 3ph VS 1ph
(OP)
Hi to all.
I have a simple question that may have a complicated answer: when testing a three phase Circuit Breaker with a single phase Current Injector, what will happen if the test is carried out only on one pole (line-in/line-out). I am presently far away from a laboratory and I cannot carry the test myself. I always tested the correct intervention of a three phase CB injecting to the Phase L1 (or A) and, with proper jumpers, exit from Phase L3 (or C). I cannot remember what then happen if each phase is tested individually. I think it would trip earlier than expected, but...I am not sure of it.
Could anyone out there help with this issue?
Thank you very much and kind regards.
Giuseppe
I have a simple question that may have a complicated answer: when testing a three phase Circuit Breaker with a single phase Current Injector, what will happen if the test is carried out only on one pole (line-in/line-out). I am presently far away from a laboratory and I cannot carry the test myself. I always tested the correct intervention of a three phase CB injecting to the Phase L1 (or A) and, with proper jumpers, exit from Phase L3 (or C). I cannot remember what then happen if each phase is tested individually. I think it would trip earlier than expected, but...I am not sure of it.
Could anyone out there help with this issue?
Thank you very much and kind regards.
Giuseppe






RE: Circuit breakers: 3ph VS 1ph
RE: Circuit breakers: 3ph VS 1ph
RE: Circuit breakers: 3ph VS 1ph
thanks for your reply.
The breaker is a Moulded Circuit Breaker, and as I have to supply from the breaker three individual single phases (Phase plus Neutral), I am unsure what the behaviour of the tripping device will be if one or two of the phases will be switched off by the downstream contactors. My fear is that the breaker will open at a lower Thermal Load.
In the past, when I was supplying Single phase Systems from a three phase Board, I always used fuses, but nowadays...
Thanks for your valuable help on this issue.
Kind regards.
Giuseppe
RE: Circuit breakers: 3ph VS 1ph
Magnetic elements (instantaneous) won't be affected.
old field guy
RE: Circuit breakers: 3ph VS 1ph
Bill
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"Why not the best?"
Jimmy Carter
RE: Circuit breakers: 3ph VS 1ph