Why Does My Circuit Breaker Keep Tripping? Causes and Safe Fixes

A breaker that keeps switching off is annoying, but it’s actually doing its job: protecting your wires and your home. The key is finding out why it trips. This guide explains the three main causes, a safe step-by-step troubleshooter, and a calculator to check if your circuit is overloaded.

In this article

1. What a circuit breaker does
2. The 3 main reasons a breaker trips
3. How to fix each cause
4. What you should never do
5. Can a breaker be faulty?
6. When to call an electrician immediately
7. Map your panel to save time
8. A real-life example
9. After a storm or flood
10. FAQ

What a circuit breaker does

A circuit breaker is an automatic switch that cuts power when the current is unsafe. It protects the wiring from overheating. Each circuit in your panel has its own breaker with a rating in amps, for example 15 A, 20 A or 30 A. When the current goes above the rating for long enough, or jumps very high suddenly, the breaker trips.

The 3 main reasons a breaker trips

1. Overload

Too many appliances on one circuit draw more current than it’s rated for. This is the most common cause. It usually happens when you turn on a high-power appliance like a flat iron, kettle, microwave or aircon while other loads are running. The breaker may trip after a few seconds or minutes.

2. Short circuit

The line wire touches the neutral (or another line) directly, causing a huge surge of current. The breaker trips instantly, sometimes with a spark, a pop or a burning smell. Causes include damaged cords, loose wires in outlets, or a faulty appliance.

3. Ground fault

Current leaks to ground, through a metal case, water or a person. If your circuit has an RCD, RCBO or GFCI, it trips at small leakages. Common causes are water in outlets, a failing water heater element, or damaged insulation. See our GFCI and RCBO guide.

How to fix each cause

Fixing an overload

• Move some appliances to another circuit (different breaker).
• Don’t run the iron, kettle and microwave at the same time.
• Have an electrician add a dedicated circuit for big appliances like aircons.

Fixing a short circuit

• Unplug everything on the circuit, then reset. If it still trips immediately, the fault is in the wiring. Call an electrician.
• If it stays on, plug appliances back one at a time. The one that trips it is faulty.

Fixing a ground fault

• Check outlets near water and outdoor outlets for moisture.
• Test appliances one by one, especially water heaters, washing machines and pumps.
• Have damaged wires or failing heaters repaired by a professional.

What you should never do

• Never replace a breaker with a higher rating to stop the tripping. The wire stays the same size and can overheat.
• Never tape or hold a breaker in the ON position.
• Never bypass an RCD, RCBO or GFCI.
• Don’t keep resetting a breaker that trips instantly. Find the fault first.

Can a breaker be faulty?

Yes. Breakers wear out, especially after many trips. A worn breaker may trip below its rating, or feel loose, warm or make noise. If the load is clearly within the rating and nothing is faulty, have an electrician test and replace the breaker with the same rating.

When to call an electrician immediately

Call a licensed electrician if you see sparks, smell burning, notice a warm or discolored panel, hear buzzing from the panel, or if a breaker trips instantly even with everything unplugged. These signs point to wiring problems that need professional repair. Learn about proper wire sizing in our wire size guide.

Map your panel to save time

Many homes have panels with unlabeled breakers. Spend 20 minutes mapping them: switch off one breaker at a time and note which lights and outlets go dark. Label each breaker clearly. Next time something trips, you’ll know immediately which rooms and appliances are on that circuit, which makes troubleshooting much faster and safer.

A real-life example

A family’s kitchen breaker kept tripping every morning. The cause: an electric kettle (1,500 W), a toaster (900 W) and a microwave (1,000 W) were all used at breakfast on the same 15 A circuit. That’s 3,400 W, or about 14.8 A at 230 V, right at the limit, plus the ref on the same circuit. The fix was simple: use the kettle first, then the microwave, and have an electrician move the ref to another circuit. No more trips.

After a storm or flood

If water reached outlets, panels or appliances, don’t reset breakers until everything is dry and has been checked by a professional. Water and electricity together can cause ground faults, short circuits and serious shock hazards.