Double interlock control circuit of three-phase asynchronous motor

The advantage of this circuit is that if you want to reverse the forward running motor, you don't have to press the stop button SB1 first, just press the reverse start button SB3 directly; of course, the same is true from reverse running to forward running. This circuit has dual electrical and mechanical "interlocking" functions, which not only improves the reliability of control, but also can realize forward-stop-reverse-stop control and forward-reverse-stop control. control.