Why does my circuit breaker keep tripping?

First identify what actually tripped

Circuit breakers and safety switches can look similar, but they do different jobs. A circuit breaker protects a circuit when excessive current flows, including overload and high-current faults. A safety switch (RCD), usually identifiable by a TEST or T button, is intended to disconnect supply when it detects leakage that can create an electric-shock risk. Some devices combine both functions.

Common reasons for repeated tripping

• Too much load on a circuit: several high-demand appliances operating together can overload the circuit.
• A faulty plug-in appliance: if a device operates only after one particular appliance is connected and switched on, that appliance may need repair or replacement.
• An electrical installation fault: damaged wiring, a faulty accessory, moisture or another installation issue can require electrical testing rather than trial-and-error resets.

A limited check you can make safely

Queensland’s Electrical Safety Office recommends unplugging appliances on the affected circuit, resetting the protective device, then reconnecting appliances one at a time to help identify a faulty appliance or overload. Only do this when there has been no shock or tingle, burning smell, smoke, heat, arcing, visible damage or other unsafe condition. If the device trips again, stop. Do not keep forcing it back on.

When the job moves beyond a user check

If the device will not remain on, trips with no obvious plug-in load, or the problem points to fixed wiring or the switchboard, the circuit needs licensed electrical diagnosis. In Western Australia, electrical work must be carried out by a person who holds the relevant electrical licence.