What To Do If The Power Distribution Box Trips?

When a circuit breaker trips, prioritize personal safety. First, ensure your hands are dry and stand on dry ground. Avoid operating the circuit breaker barefoot or on wet ground. Check for any burning smells, smoke, or sparks. If any are present, leave the area immediately and contact the fire department or a professional electrician.

I. Observe the Tripped Switch Status
Open the circuit breaker box and check the tripped switch:
Handle in the middle → Overload or short circuit
Small button popped out → Residual current protection
Handle fully in the OFF position → Possibly accidental activation

II. Handling Based on Situation
1. Overload Tripping
Symptoms: Trips shortly after being reset, or trips when multiple high-power appliances are turned on simultaneously.

Cause: The total power of the appliances used simultaneously exceeds the capacity of the circuit or switch.

Solution: Turn off some high-power appliances on that circuit. Then reset the circuit breaker.

If overloads occur frequently, it is recommended to have an electrician assess whether a thicker wire or a higher current switch is needed. Do not arbitrarily replace the switch with a larger one, as this poses a fire risk.

2. Residual Current Circuit Breaker (RCCB) Tripping

Symptoms: The circuit breaker trips immediately after being switched on, or frequently due to a specific appliance, and the small button on the RCCB pops up.

Causes: The appliance or wiring is leaking current, such as water in the socket or damaged wiring inside the wall, posing a risk of electric shock.

Solution: Unplug all appliances on this circuit. Press the small button back on and switch on again. Plug the appliances back in one by one; the one that trips requires repair or replacement. If the circuit breaker still trips after unplugging all appliances, it indicates a leak in the wall wiring or socket due to moisture, requiring a professional electrician's attention.

3. Short Circuit Tripping

Symptoms: The circuit breaker trips immediately with a "pop" sound upon switching on, and sparks may be visible.

Causes: The live wire and neutral wire are in direct contact, such as a burnt plug or damaged wire insulation touching.

Solution: Do not repeatedly force the circuit breaker to turn on, as this may damage the switch or cause a fire. Check the plugs and wires of appliances on the tripped circuit for burnt or damaged insulation. Unplug the suspected appliance and try turning on the circuit breaker again. If the circuit breaker still trips, it's likely a short circuit in the wiring inside the wall. Please have a professional electrician handle it.

4. Main breaker trips but branch circuit breakers don't trip

Symptoms: The main breaker trips, but the branch circuit breakers below it don't trip.

Possible causes:

The main breaker itself is old or damaged.

The combined current of all branch circuit breakers exceeds the rated value of the main breaker (less common).

The most dangerous possibility: A branch circuit breaker is faulty; it didn't trip, but the fault current is very high, causing the main breaker to trip.

Solution: Close all branch circuit breakers one by one, then close the main breaker, and open the branch circuit breakers one by one. If the main breaker trips when opening a branch circuit breaker, it indicates a problem in that circuit; troubleshoot as described above. If the main breaker still cannot be closed after all branch circuit breakers are closed, the main breaker may be damaged.