Wondering what's going on in there?
How a breaker works, in plain English
Every circuit in your home runs through a breaker in the panel. The breaker is a safety switch. When too much power flows, or power leaks where it shouldn't, it flips off before the wires can overheat.
- The main breaker. The big one at the top. It can shut off the whole house.
- Room circuits. Each breaker feeds a group of outlets or lights. Too many power-hungry things at once trips it.
- Big appliance circuits. An AC, dryer, oven or water heater usually has its own breaker, often double-wide for 240 volts.
- Safety breakers. Some breakers have a Test button. They trip when power leaks through water (GFCI) or sparks in wiring (AFCI).
So a breaker usually trips for one of four reasons (Bob Vila): too much on the circuit, a short circuit, a ground fault, or a worn-out breaker. The questions at the top sort them out, safest checks first.
AC breaker tripping? See our guide to an AC blowing warm air. Dryer? See a dryer that's not heating. Hardwired smoke alarms chirping after a trip? See a smoke detector that's beeping.
Lights flickering? See our guide to flickering lights.
Rather not do it yourself? Call an electrician.
That's a fine choice. Maybe you're busy. Maybe you're selling the house and just want it done right. An electrician can find out what's tripping the breaker and fix it safely.
Most electricians charge $50–$130 an hour, and many charge a $100–$200 service call that covers the first hour. A new panel, if you need one, costs a lot more.
Find electricians near you
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What to say
Calling a pro? Here's what to say.
A few lines to read when they pick up, and the questions to ask before anyone comes out.
Before you call
Say this
Hi. A breaker in my panel keeps tripping. When's the soonest you can get here? And what's your fee for the visit? Does it go toward the repair?
Always ask
- What's your fee to come out, and does it cover the first hour?
- Do you charge by the job or by the hour?
- Will you tell me the full price before you start any work?
Watch out if
- They push rewiring the whole house on the first visit for a small problem.
- They can't show you a license number.
- They won't give you a price before starting.
Feeling pushed to decide on the spot? You can say no and hang up. You owe nothing for a phone call.
Answer up to 5 quick questions. We'll give you the words a pro uses.
Answer the questions →More of a list person?
Common breaker problems, causes, tests and costs
Find the row that sounds like yours. The quick test is something you can check safely in a few minutes.
| What you notice | What it probably is | Quick test | Do it yourself | With a pro | Verdict |
|---|---|---|---|---|---|
| Burning smell, scorch marks, heat or buzzing at the panel | Danger signs at the panel | Look and sniff from a step back. Don't touch | Pro job | $100–$2,193 | CALLSee the answer: Danger signs at the panel |
| Trips after a leak, a flood or rain | Water got into the wiring | Think about what got wet | Pro job | $100–$200 | CALLSee the answer: Water got into the wiring |
| Whole house goes dark; main breaker tripped | The main breaker keeps tripping | Look at the big breaker at the top of the panel | Pro job | $100–$2,193 | CALLSee the answer: The main breaker keeps tripping |
| A big appliance's breaker keeps tripping | A big appliance has a problem | Read the breaker's label | Pro job | $100–$260 | CALLSee the answer: A big appliance has a problem |
| Trips right away, even with things unplugged | A short circuit or a worn-out breaker | One reset with things unplugged | Pro job | $100–$260 | CALLSee the answer: A short circuit or a worn-out breaker |
| Trips at random or after rain; breaker has a Test button | A safety breaker sensed a leak or a spark | Look for a Test button on the breaker | Pro job | $100–$200 | CALLSee the answer: A safety breaker sensed a leak or a spark |
| Trips when a few things run at once | Too much is plugged into one circuit | Plug things back in one at a time | Free | Not needed | FIXSee the answer: Too much is plugged into one circuit |
| Trips with only small things plugged in | A wiring problem on the circuit | Plug things in one at a time | Pro job | $100–$200 | CALLSee the answer: A wiring problem on the circuit |
| One appliance trips breakers in any room | That appliance has a short | Plug it in on a different circuit | Free | Not needed | FIXSee the answer: That appliance has a short |
2026 U.S. averages, rounded. Pro prices include parts and labor. Most electricians charge $50–$130 an hour, and many charge a $100–$200 service call that covers the first hour. Nights, weekends and big cities cost more. See all repair prices
Want proof it's the appliance, not the wiring?
The other-room test
This one test tells you whether the problem is one appliance or the circuit itself. Bob Vila calls it the short-circuit test.
- Check the appliance's cord. If it's cracked, melted or frayed, stop. Don't plug it in.
- Plug the appliance into an outlet in another room, on a different breaker.
- Turn it on and watch.
- That room's breaker trips too: the appliance has a short. Stop using it.
- It works fine there: the first circuit is probably overloaded. Move something to another circuit. If it still trips with little plugged in, call an electrician.
Is a tripping breaker dangerous?
Leave it off and call an electrician if…
A breaker that trips is doing its job. Resetting it over and over is what's dangerous. It can cause an arc flash, a sudden spark that can burn you (Bob Vila, UW Environmental Health and Safety).
- You smell burning, or see smoke or scorch marks.
- The panel or a breaker feels hot, or it buzzes.
- The breaker won't stay on, or trips again after one reset.
- The panel or anything on the circuit got wet.
- An outlet or switch is warm, cracked or discolored.
If you see smoke or flames, get everyone out and call 911 from outside.
Got a big electrician's quote?
New breaker, or new panel?
Most tripping breakers need nothing more than moving a space heater. When you need an electrician, here's what's fair:
- A service call: HomeAdvisor lists $100–$200, which covers the first hour. After that, $50–$130 an hour.
- A new breaker: Angi lists $100–$200, and HomeGuide lists $100–$260, installed.
- A new panel: Angi lists $518–$2,193, about $1,347 on average. It can reach $4,500 with upgrades.
Example: $180 to replace one worn-out breaker is fair. Being told you need a whole new panel because one breaker trips is worth a second opinion, unless the panel shows heat damage.
Ran into a word you don't know?
Electrical words, explained
Read these before you open the panel door. The drawings show roughly what each part looks like.
- Breaker (circuit breaker)
- A safety switch in the panel. It flips off when too much power flows through one circuit.
- Breaker panel
- The metal box, often in a garage, basement or closet, where all the breakers are.
- Main breaker
- The big breaker at the top of the panel. It controls power to the whole house.
- Tripped
- When a breaker shuts itself off. Its handle sits in the middle or at OFF.
- Circuit
- One loop of wiring from a breaker to a group of outlets, lights or one appliance.
- Overload
- More power running on one circuit than it's built for.
- Short circuit
- When wires touch where they shouldn't, so power rushes through all at once.
- Ground fault
- When power leaks out of the wiring, often through water.
- GFCI
- A breaker or outlet with a Test button that shuts off power when it senses a leak, like through water.
- AFCI
- A breaker with a Test button that shuts off power when it senses sparking in the wiring.
- Double-wide breaker
- Two breakers joined together. Big 240-volt appliances like dryers and ACs use them.
- Arc flash
- A sudden, dangerous spark. Resetting a breaker over and over can cause one.
Still have questions?
Questions people ask most
Is a breaker that keeps tripping an emergency?
A breaker that keeps tripping is an emergency if you smell burning or see smoke, heat, scorch marks or water at the panel. Then don't touch it, and call an electrician today. If you see smoke or flames, get everyone out and call 911 from outside. Otherwise, the trip itself is the breaker protecting you. Reset it once, and if it trips again, leave it off and call an electrician.
Why does my breaker keep tripping?
A breaker usually keeps tripping because too much is plugged into one circuit. It can also be one bad appliance, a short circuit, a ground fault, or a worn-out breaker. The questions at the top sort them out.
Why does my AC breaker keep tripping?
An AC usually has its own breaker, and it runs on 240 volts. A trip usually means a problem in the AC or its wiring. Leave it off after one reset and call an AC tech or electrician.
Why does my microwave keep tripping the breaker?
A countertop microwave uses a lot of power, so running it with a toaster or kettle on the same circuit can overload it. Try it in another room. If it trips there too, the microwave has a problem.
Why does my breaker trip with nothing plugged in?
A breaker that trips with nothing plugged in points to a short in the wiring, an outlet, or a worn-out breaker. Leave it off and call an electrician.
Can I replace a breaker myself?
No, replacing a breaker isn't a do-it-yourself job. Bob Vila says replacing breakers and other panel work is a job for a licensed electrician.
What's the difference between a GFCI and an AFCI?
A GFCI shuts off power when it senses a leak, like through water, and an AFCI shuts off power when it senses sparking in the wiring. Both have a Test button.
Who do I call when a breaker keeps tripping?
Call a licensed electrician when a breaker keeps tripping after one reset. If only one big appliance trips it, like an AC or a dryer, an electrician or a repair tech for that appliance can find the cause. Panel and breaker work is always an electrician's job.
How we built this
The questions follow the order an electrician checks a tripping breaker: danger signs first, then which breaker it is, one reset, and when it trips, followed by the overload test or the move-it test. Each answer makes some causes more likely and others less likely.
Prices are 2026 national averages from published repair-cost guides, rounded. Your local prices will differ.
- Bob Vila, why is my circuit breaker tripping (December 2023)
- HomeTips, circuit breaker troubleshooting (read October 2026)
- UW Environmental Health and Safety, resetting circuit breakers (April 2022)
- ESFI, AFCI survey results (October 2023)
- Angi, cost to replace an electrical panel and breakers (July 2026)
- HomeGuide, electrical outlet repair cost, including breakers (September 2025)
- HomeAdvisor, cost to hire an electrician (June 2026)
How we make money: some links go to parts stores that pay us a small commission, and some pro listings pay us when you call them. Verdicts come from the diagnosis, not from who pays more.