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Basic principle of selection of AC/DC dual-purpose motor for circuit breaker

Jul 17, 2018

To protect the motor through the circuit breaker, it is necessary to consider the two characteristics of the AC/DC motor of the circuit breaker: the first one should have a certain overload capacity, and the other is that the starting current is usually several times the rated current. It can even be up to ten times when reversible or reverse braking.


Therefore, in order to ensure reliable operation and smooth start-up of the AC/DC motor of the circuit breaker, several basic principles should be followed when performing the Aze: 1. Determine the long-delay action current of the circuit breaker according to the rated current of the motor. Setting value; 2. The return time of the 6 times long delay action current setting value of the circuit breaker is longer than the actual starting time of the motor.


It should be noted that for some AC/DC dual-purpose motors that need to be started frequently, if the phase-breaking machine is low or has a phase-failure protection device, then the combination of the fuse and the magnetic starter is used to control and protect. It is also suitable because this protection method is convenient for remote control.