What is meant by the KA-rating of a circuit breaker? In
this regard, discuss the stresses experienced by the
circuit breakers
Answer Posted / chethan
kilo ampere rating
| Is This Answer Correct ? | 17 Yes | 10 No |
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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?