Why a Circuit Breaker Keeps Tripping and What to Do

Highland Volt · Highland, CA · Updated 2026

A tripping breaker is doing its job

A circuit breaker exists to protect the wire behind your walls. Every wire has a limit on the current it can carry before it overheats, and the breaker is matched to that limit. When current exceeds it, the breaker opens and cuts power. The trip is not the problem. It is the signal that a problem exists somewhere on that circuit. The goal is to find out which of the five causes you are dealing with.

1. Overloaded circuit

This is the most common cause in Highland homes, especially in summer. An overload happens when the devices on one circuit draw more current than the circuit is rated for. The classic pattern is a breaker that holds for a while and then trips when a second appliance starts: a space heater plus a vacuum, a microwave plus a toaster oven, or a window air conditioner on a bedroom circuit shared with a computer.

The test is simple. Unplug everything on the circuit, reset the breaker, and add devices back one at a time. If the breaker holds with a lighter load, you have an overload. The lasting fix is a dedicated circuit for the heavy appliance, which is new wiring work.

2. Short circuit

A short circuit occurs when a hot conductor touches a neutral conductor. Resistance drops to almost nothing, current surges, and the breaker trips instantly, often with a pop. Causes include a damaged cord, a failed appliance, a loose connection in an outlet or switch box, or a nail or screw driven through a cable. Signs include a breaker that trips the moment it is reset, a burning smell, or dark discoloration on an outlet.

3. Ground fault

A ground fault is current leaking from a hot conductor to ground, through a metal box, a wet surface, or a person. Water is the usual trigger, which is why ground faults show up in bathrooms, kitchens, garages, and outdoor outlets. A GFCI outlet or GFCI breaker trips on very small leakage currents because its purpose is to protect people from shock. If a GFCI trips after rain or irrigation, moisture in an exterior box is the likely source. See where GFCI protection is required in California.

4. Arc fault

Newer homes and remodeled rooms have arc-fault circuit interrupter breakers, identifiable by a test button on the breaker. An AFCI listens for the electrical signature of arcing, the sparking that occurs at a loose connection or damaged wire and that can start a fire without ever drawing enough current to trip a standard breaker. An AFCI that trips repeatedly may be detecting a real fault, or it may be reacting to a particular appliance with a worn motor. Either way it should be diagnosed, not bypassed.

5. A worn or failing breaker

Breakers are mechanical devices and wear out. A breaker that feels loose, will not stay reset with nothing connected, is hot to the touch, or trips under a load it handled for years may have reached the end of its life. Certain older panel brands are known for breaker problems. Our guide to the signs you need a panel upgrade explains which.

What you can safely do yourself

• Note which breaker tripped and what was running when it did.
• Turn off or unplug devices on that circuit.
• Push the breaker fully to off, then back to on. A tripped breaker rests in a middle position and will not reset until it is moved to off first.
• Restore devices one at a time to identify an overload or a single faulty appliance.

When to stop and call an electrician

Call the same day if the breaker trips immediately on reset, if you smell burning or see scorch marks, if the breaker or panel is hot, if you hear buzzing or crackling, or if the same breaker trips more than a couple of times in a week with no clear overload. Repeatedly forcing a breaker back on sends current into a fault again and again. The Electrical Safety Foundation publishes home electrical safety guidance that reinforces the same rule: a breaker that will not stay on is a warning, not an inconvenience.

Frequently asked questions

Why does my circuit breaker keep tripping?

The five causes are an overloaded circuit, a short circuit, a ground fault, an arc fault detected by an AFCI breaker, or a worn-out breaker. Overload is the most common.

Is it dangerous if a breaker keeps tripping?

It can be. The breaker is signaling a problem on the circuit. A breaker that trips immediately when reset, or any burning smell or heat at the panel, needs an electrician the same day.

How do I reset a tripped breaker?

Turn off or unplug devices on the circuit, push the breaker fully to the off position, then push it back to on. A tripped breaker sits in a middle position and must be moved to off first.

Can a circuit breaker go bad?

Yes. Breakers are mechanical and wear out. A breaker that will not stay reset with nothing connected, feels loose, or runs hot likely needs replacement.

Why does my breaker trip when I run the air conditioner?

The air conditioner is likely sharing a circuit with other loads, or the circuit is undersized for it. A dedicated circuit sized for the unit is the lasting fix.