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Three-phase motor using the relay to prevent phase short cir

2016-09-01 14:40  
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Three-phase motor using the relay to prevent phase short circuit switching circuit
Just shown in the figure, a relay K is used to connect its coil to the main road. If the primary contact’s adhesion primary live line is with electricity or arc is not extinguished, K pulls to drive the normally closed contacts K to cut off STF and STR loop. So no matter what the forward or reverse button is pressed, the motor can not be started.