The main contactor coil gets supply through phase R – OFF push
button – ON push button – main coil – phase Y.
The auxiliary contact M1 becomes
NC from NO.
As soon as ON push button is
released, the main contactor coil gets supply through phase R – OFF push button
– NC of Main Contact – Main Contactor coil – phase Y.
The main contactor remains
ON during running condition of the motor.
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