Why does a circuit breaker keep tripping, and when is it a problem?

Updated November 10, 2026 · KeystoneProGuide editorial team

What does a tripped breaker mean?

That the breaker did its job. The Electrical Safety Foundation, a nonprofit safety group, says every panel has fuses or breakers that protect the wires in each circuit from overheating and starting a fire, by stopping the current when it exceeds the safe level for that part of the system. A breaker can be reset once the problem is resolved; a fuse that blows has to be replaced.

The foundation says the likeliest cause of a tripped breaker is too many appliances overloading the circuit, and that it should be dealt with immediately rather than reset over and over.

How do you reset a breaker safely?

The foundation's steps, in order:

1. Unplug or switch off the appliances in the room that lost power.
2. Go to the main panel and open its cover.
3. Find the tripped breaker. It will be in the off position or stuck between on and off.
4. Switch it fully off, then back on.

If the problem continues, the foundation says there may be more serious issues and an electrician should diagnose them. Open only the panel door. The Consumer Product Safety Commission advises consumers not to open the interior of the panelboard or breaker compartment, because that can expose live wires.

What about a fuse that keeps blowing?

Replace it only with the same rating. The foundation says a blown fuse must be unscrewed and thrown away, the replacement must match the amperage rating of the circuit, and fitting a larger one is a very dangerous practice and a serious fire hazard. A fuse that blows repeatedly is the same warning as a breaker that trips repeatedly, and the National Fire Protection Association puts both on its list of reasons to call a qualified electrician.

Why does it happen most in winter?

Often because of heaters. The NFPA says to plug only one heat-producing appliance, such as a space heater, toaster or coffee maker, into a receptacle at a time. The CPSC's winter guidance says electric portable heaters should always go into a wall outlet, never a power strip, with the cord never run under a rug. The foundation says extension cords should never be used with space heaters or air conditioners.

A breaker that trips whenever the heater runs fits the overload the foundation describes. Its advice for outlets that are routinely overloaded is to have additional circuits or outlets added by a qualified electrician.

Why does a GFCI or AFCI trip?

Because it detected something a standard breaker would not. A ground-fault circuit interrupter, the NFPA explains, shuts off power to protect against shock from a ground fault, such as one caused by a defective appliance or corded tool. An arc-fault circuit interrupter shuts off power when it senses abnormal arcing, which the NFPA says can be caused by a nail touching a wire or by a defective appliance cord.

Because the NFPA's examples of these faults include defective appliances and cords, unplugging what is on the circuit before you reset, as the foundation's steps already say, is the sensible first move. If the device keeps tripping, the NFPA says a defective device should be replaced immediately and that AFCIs and GFCIs should be installed by a qualified electrician, so that is the point to call one. The foundation adds that the devices should be tested monthly, and the NFPA warns that a device which no longer works gives a false sense of security.

When is a tripping breaker a sign of something worse?

When it comes with other symptoms. The NFPA's list for calling an electrician includes, besides frequent tripping, warm or discolored outlets, a burning or rubbery smell, flickering or dimming lights, sparks from an outlet and a tingling feeling from an appliance. The foundation adds sizzling or buzzing sounds and says to contact an electrician immediately when you notice them. In a house wired with aluminum, the CPSC adds circuits that stop working and faceplates that are warm to the touch.

Power strips are not a fix for any of this. The U.S. Fire Administration says not to overload them and to use only strips with internal overload protection.

What does the repair cost?

It depends on the cause. If the breaker itself has failed, Angi, a home-services marketplace, puts replacing one at $100 to $200 including installation, with the breaker alone usually $5 to $40, and AFCI or GFCI breakers $70 or more. If the answer is a new circuit, or more capacity, the job is larger; the panel upgrade guide covers that end. These are national figures.

What should you tell the electrician?

• Which breaker trips, and what is plugged into that circuit.
• Whether it trips at once on reset, or only when certain appliances run.
• Whether it is a standard breaker, an AFCI or a GFCI.
• Any of the other symptoms above, especially heat, smells or sparks.

What the GFCI and AFCI devices protect against is explained in the GFCI and AFCI guide, and the full list of warning signs is in the warning signs guide. Electricians are listed on the electricians directory page.

Sources

1. Understanding Your Home Electrical System, Electrical Safety Foundation International (ESFI)
2. Home Electrical Fires, Electrical Safety Foundation International (ESFI)
3. Electrical Home Fire Safety, National Fire Protection Association (NFPA)
4. Appliance and Electrical Fire Safety, U.S. Fire Administration
5. Winter Storm May Knock Out Power; CPSC Warns of Deadly Carbon Monoxide and Fire Risks, U.S. Consumer Product Safety Commission
6. May Is National Electrical Safety Month: Good News for Homeowners - Aluminum Wiring Fix Still Available, U.S. Consumer Product Safety Commission
7. How Much Does It Cost to Upgrade an Electrical Panel? [2026 Data], Angi