First, Which One Actually Tripped?
Most Australian switchboards have two different things that can trip: individual circuit breakers (small switches, one per circuit, that protect against overload and short circuits) and a safety switch or RCD (usually one or two switches that protect against electric shock by detecting current leaking to earth). Knowing which one tripped narrows down the cause fast.
If only one labelled circuit breaker has dropped and everything else still has power, it's almost always that specific circuit. If the main safety switch has tripped and killed power to a large section or the whole house, it's more likely a leakage fault somewhere, often moisture or a failing appliance.
The Most Common Causes
- Overloaded circuit — too many high-draw appliances (heater, kettle, microwave, hair dryer) running on one circuit at the same time.
- A faulty appliance — something plugged in, not the house wiring, is actually the problem. Common culprits are heaters, toasters, and old appliances with failing insulation.
- Moisture — outdoor power points, irrigation systems or an appliance near water can trip a safety switch, especially after rain.
- Ageing wiring or a loose connection — more likely in older homes, and the one that genuinely needs an electrician rather than a reset.
A Simple Way to Narrow It Down
Unplug everything connected to the affected circuit, reset the breaker, then plug items back in one at a time, waiting a minute between each. If it trips again as soon as one particular item goes back in, that appliance is very likely the cause.
When It's Not a DIY Fix
If a breaker won't stay on even with nothing plugged into that circuit, or trips again within seconds of being reset, that points to a fault in the fixed wiring itself, not something you've plugged in. At that point, stop resetting it and call an electrician.
Don't keep flipping a breaker back on if it won't hold. A breaker that trips immediately and repeatedly is often arcing or shorting internally in the wiring, and each reset is another chance for that fault to do real damage or start a fire.
When to Call Us vs Wait Till Morning
Call immediately for a burning smell, visible sparking, a breaker that won't reset at all, or if the problem affects safety-critical circuits like a medical device or a freezer full of food. If it's a single, identified circuit that's safely isolated and everything else in the house is fine, it can usually wait for a standard appointment.