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Three-phase motor contactor auxiliary contact interlock swit

2016-09-01 13:43  
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Three-phase motor contactor auxiliary contact interlock switching circuit
The circuit shown as the chart uses two AC contactors KMF and KMR. KMF is used for forward, KMR is used for reversal. As the main contact wiring phase sequence of AC contactor is different, when the two contacts are at work, the motor turning is opposite. Because of this, the operation dose not allow KMF and KMR to be pulled at the same time. To this point, in the forward and reverse control circuits, each circuit is stringed into the normally closed contact of the other one. Contactor self-protection auxiliary contacts KMF, KMR are increased in the circuit.