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How to choose suitable contactor and circuit breaker for electric motor

Under the AC circuit of 380V, how to choose suitable current of circuit breaker and contactor. The current size = 2 times of the power (KW), that is, 1.736*ITV80% (power factor).

The current of the circuit breaker (fuse in the picture) + switch needs to be larger. It can be 1.3 times. Take 22KW motor for example, its working current is about 45A, the starting current is about 8 times, it can choose 63A molded case circuit breaker.

AC contactors and thermal relays are also selected in the same way.

choose suitable circuit breaker and contactor

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By | 2018-11-14T12:30:46+00:00 July 13th, 2018|Contactor|