circuit breaker breaking capacity
circuit breaker breaking capacity
(OP)
Hi, I wonder if two pole circuit breaker has half times the short circuit breaking capacity of single pole circuit breaker? since as we increase the poles on the circuit it means less voltage on the contacts and from there on can we say circuit breaker s.c capacity is inversely proportional to the voltage across the contacts??






RE: circuit breaker breaking capacity
Bill
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"Why not the best?"
Jimmy Carter
RE: circuit breaker breaking capacity
RE: circuit breaker breaking capacity
with higher breaking capacities.
RE: circuit breaker breaking capacity
RE: circuit breaker breaking capacity
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: circuit breaker breaking capacity
RE: circuit breaker breaking capacity
Have a look at this file I have uploaded
desertfox
RE: circuit breaker breaking capacity
Perhaps you are mixing up, multiple contacts in series for the "same" pole with two pole circuit breakers. They are not the same topics. What desertfox uploaded is a two pole breaker. While only pole comes in play for a ground fault, for direct line to line fault, both poles will come in play but both will see the same amount of current.
Multiple breaks in a "pole" are commonly employed of high voltage circuit breakers for arc quenching and even at low voltages for DC circuits as DC does not have zero crossing.
For LV ac circuits, single break units have been sufficient. Multiple breaks are more to handle higher voltages and resultant TRVs, than the current
Rafiq Bulsara
http://www.srengineersct.com
RE: circuit breaker breaking capacity
RE: circuit breaker breaking capacity
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If we learn from our mistakes I'm getting a great education!
RE: circuit breaker breaking capacity
Then the first answer was correct. NO.
Rafiq Bulsara
http://www.srengineersct.com