The choice of Motor Protection Circuit Breaker

Update date:2018-01-11 Source:MAXGE

The use of circuit breakers to protect the motor, must pay attention to the motor (mainly AC induction motor) two features: one is to have a certain overload; the second is the starting current is usually several times the rated current (reversible operation or reverse connection Dynamic even up to ten times). Therefore, in order to ensure the reliable operation of the motor and start smoothly, the choice of circuit breaker should follow the following principles:


(1) according to the rated current of the motor to determine the circuit breaker long-delay operating current setting value.


(2) 6 times longer circuit breaker delay action current setting value of the return time to be longer than the actual starting time of the motor.


(3) The instantaneous operating current of circuit breaker setting value: cage motor should be 8 to 15 times the rated current of the release; winding motor should be 3 to 6 times the rated current of the release.


Of course, for the motor that needs to start frequently, it is more appropriate to control and protect the motor in the way that the fuse and the magnetic starter are combined if the phase failure operation probability is not high or the phase failure protection device is provided, because this protection method is convenient Distance control.

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