Why Does My Breaker Keep Tripping? The Three Causes and How to Tell Them Apart

A tripping breaker is not a faulty breaker. It's a breaker doing exactly what it was installed to do. The useful question is what it's protecting you from, and there are only three answers.

1. Overload — the boring one

Too much current on one circuit. This is the most common cause and the easiest to spot: the breaker trips a few seconds or minutes after you switch on a specific appliance, and it usually holds if you unplug something else first.

The classic Massachusetts version is a kitchen where the microwave, toaster and coffee maker all share one 20 amp circuit that was adequate in 1978. The fix is a dedicated circuit for the heavy appliance, not a bigger breaker. Never, ever put a larger breaker on the same wire.

2. Short circuit — the fast one

A hot conductor touching a neutral. This trips instantly and hard, often with a bang, a flash or a burnt smell. It doesn't wait for load. If your breaker trips the moment you reset it with nothing plugged in, you are almost certainly looking at a short.

Common sources: a damaged cord, a nail or screw driven through cable during a renovation, rodent damage in an attic or basement, or a failing appliance. Stop resetting it and call for service.

3. Ground fault — the sneaky one

Current leaking to ground where it shouldn't. GFCI outlets and breakers are built to catch this at a few milliamps because that's the level that hurts people. Ground faults are common in bathrooms, kitchens, basements, garages and outdoor circuits — anywhere moisture can get in.

How to narrow it down yourself

• Unplug everything on the circuit, then reset. If it holds, the problem is a device, not the wiring.
• Plug things back in one at a time and wait. The item that trips it is your culprit.
• If it trips with nothing connected, the fault is in the wiring or the breaker itself. Stop there.
• Note whether it trips instantly or after a delay. Instant points to a short; delayed points to overload.
• If you smell burning or the panel is warm, switch it off and call immediately.

When to stop and call

Repeated resetting of a breaker on a short circuit is genuinely dangerous. If it trips instantly, if you can smell burning, or if the breaker itself feels hot, leave it off and get an electrician out. Our emergency line runs 24 hours a day.