✅ To identify any faults in the Miniature Circuit Breaker (MCB), such as tripping or damage. ✅Disconnect the power supply to the affected circuit for a safe working environment. ✅Remove the faulty MCB from the distribution board without damaging the wiring or busbars. ✅Install a new or repaired MCB with the correct rating for the circuit's load. ✅Reconnect the power and test the circuit to ensure proper functioning and that the new MCB trips under fault conditions.