MCB - MCB is getting tripped during power up, how to solve this problem?

When I press the start or stop button in the MCB, and then when I power the MCB it is getting tripped, so what is the reason for that?

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It could be because of two reasons

  • At first we must check the power cable, so check its resistance and also check if the power cable is grounded
  • Short circuit or overload could be the other reason

Because there is probably a short circuit (or) wiring issue in the control circuit (or) associated load, the MCB trips when you click the start/stop button and turn it on. It might also result from:

NO/NC connectors are not wired correctly.

Phase-to-phase or direct phase-to-neutral fault

Shorted motor (or) contactor coil

Overload condition

Check the load connections, insulation, and wiring.