8 March 2017

Control Circuit of Direct ON Line Starter

Working of Direct on Line Starter Control circuit

  • Press ON Push button. 
  • 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.
control circuit of direct on line starter


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