Why Does My Breaker Keep Tripping? 6 Causes and Fixes
A breaker that keeps tripping is doing its job — protecting you from a problem. The most common cause is an overloaded circuit (too many devices on one breaker). Other causes are a short circuit, a ground fault, a faulty appliance, dangerous arcing, or a worn-out breaker. Here’s how to tell the causes apart, the exact diagnostic sequence you can safely run yourself, and the red flags that mean stop and call a pro.
First, Know What a Trip Means
A breaker trips to stop dangerous current flow before wires overheat. This matters more than most homeowners realize: electrical distribution and lighting equipment is involved in roughly 46,000 U.S. home fires per year according to NFPA research — and many of those start on circuits where warning signs were ignored. Never just keep resetting a tripping breaker. Each reset without finding the cause re-energizes whatever fault tripped it.
The Three Core Causes — and How to Tell Which One You Have
Almost every trip traces to one of three electrical events. The clues are in when and how fast the breaker trips:
| Cause | What’s Happening | Telltale Signs |
|---|---|---|
| Overload | Circuit carrying more amps than its rating for a sustained period | Trips after minutes of heavy use; predictable (always when the heater + microwave run); resets fine and holds with less load |
| Short circuit | Hot wire touches neutral — a sudden, massive current surge | Trips instantly, often with a snap; may re-trip immediately on reset; possible scorch marks, melted insulation, or burning smell |
| Ground fault | Hot wire contacts ground or a grounded surface (common in damp areas) | GFCI breaker/outlet trips; often tied to one appliance or a wet location; trips even at low load |
1. Overloaded Circuit (Most Common)
A standard 15-amp circuit can deliver about 1,800 watts — and continuous loads should stay under 80% of that (1,440W). Now do the space-heater math: a typical 1500W space heater draws 12.5 amps all by itself — over 80% of a 15A circuit. Add a TV, a lamp, and a phone charger on the same circuit and you’re past the limit. This is why space heaters are the classic winter trip-trigger, and why ESFI recommends plugging them directly into a wall outlet, never a power strip, with nothing else heavy on the circuit.
Fix: Spread high-draw devices (space heaters, hair dryers, microwaves, toasters) across different circuits. If the same overload recurs in daily life, you need an additional circuit — typically $250–$900 installed.
2. Short Circuit
A hot-to-neutral contact dumps a near-instant current spike — the breaker trips in milliseconds. Causes include damaged cable, chewed wiring, failed devices, or a loose connection that finally touched. Fix: This is a pro diagnosis. A short that trips the breaker instantly with nothing plugged in means the fault is in the wiring itself.
3. Ground Fault
Current leaking to ground — through moisture, damaged insulation, or a failing appliance — trips GFCI protection at as little as 5 milliamps, because that’s the level that protects people from shock. Common in bathrooms, kitchens, garages, and outdoor circuits. Fix: Reset the GFCI once. If it re-trips, unplug everything on the circuit and reset again; if it still trips, the fault is in the wiring — call a pro.
The Other Three Causes
4. Faulty Appliance
A failing motor, heating element, or power supply can trip the breaker every time the appliance runs. The diagnostic sequence below isolates it.
5. Arc Fault (AFCI Trips)
AFCI breakers detect the signature of dangerous arcing — frayed cords, loose terminations, nails through cables. AFCIs can also nuisance-trip on certain electronics, but never assume that’s the case. Fix: Pro diagnosis to find (or rule out) the wiring fault.
6. Worn or Faulty Breaker
Least common, but real: old breakers weaken with age and repeated trips, eventually tripping below their rated load — or refusing to reset at all. Fix: Breaker replacement by an electrician, $150–$400.
How to Diagnose It Yourself: The Safe Sequence
- Note the pattern. Which breaker trips, what was running, and how fast did it trip (instantly vs. after several minutes)? Instant = likely short/ground fault. Delayed = likely overload.
- Unplug everything on the affected circuit — every cord, every room the breaker covers.
- Reset the breaker firmly: push fully to OFF, then to ON.
- If it trips immediately with nothing plugged in, stop. The fault is in the wiring or a hardwired device. Call an electrician.
- If it holds, plug devices back in one at a time, waiting a few minutes between each. The device that triggers the trip is your culprit — repair it, replace it, or move it to a different circuit.
- If everything plugs back in fine, you likely had a momentary overload. Redistribute heavy loads and watch the pattern.
Total current check: add up the wattage of everything on the circuit and divide by 120. If the result approaches the breaker’s amp rating (15 or 20), you’ve found your overload.
Is It the Breaker Itself or the Circuit?
Usually the circuit. Suspect the breaker itself only when:
- It trips at loads well below its rating (a 20A breaker tripping at 8–10 amps of measured load)
- It won’t reset even with the circuit unloaded, or feels loose with no firm ON click
- It’s hot to the touch, discolored, or buzzing
- The panel is a recalled brand (Federal Pacific, Zinsco) — in which case the real conversation is a panel replacement
An electrician can confirm with a clamp meter in minutes. Typical electrician rates apply — usually a $100–$200 diagnostic visit.
When to Call an Electrician — or Treat It as an Emergency
Call a pro promptly for: tripping with nothing plugged in, a breaker that won’t reset, repeated trips you can’t trace, or any AFCI trips you can’t explain. These overlap heavily with the broader signs you need an electrician.
Escalate immediately — flip the breaker off and leave it off — if a trip comes with a burning smell, scorch marks, buzzing, or a warm panel. That combination suggests active overheating, and per NFPA fire data, overheated wiring connections are a leading ignition source in home electrical fires. Follow the step-by-step electrical emergency guide for what to do in the moment.
Frequently Asked Questions
Why does my breaker keep tripping? Most often an overloaded circuit — too many watts on one breaker. Other causes, in rough order of likelihood: a faulty appliance, a ground fault, a short circuit, an arc fault, or a worn-out breaker.
How do I know if it’s an overload or a short circuit? Timing. An overload trips after minutes of heavy use and holds when you reduce the load. A short circuit trips instantly — often the moment you reset — and may leave scorch marks or a burning smell.
Why does my breaker trip when I run a space heater? A 1500W space heater draws 12.5 amps — over 80% of a 15-amp circuit by itself. Anything else significant on the same circuit pushes it past its limit. Move the heater to a lightly loaded circuit and plug it directly into the wall, per ESFI guidance.
Should I replace a breaker that keeps tripping? Usually no — the breaker is typically working correctly and protecting a real fault. Replace it only if it’s proven faulty (trips far below rated load or won’t reset). See circuit breaker replacement cost.
Why does my breaker trip with nothing plugged in? That points to a short circuit, ground fault, or damaged wiring — not something you can fix by resetting. Leave the breaker off and call a licensed electrician.
Last updated: June 11, 2026. For informational purposes only; diagnostic costs anchored to BLS electrician wage data (May 2025). Fire-risk context from NFPA home electrical fire research and ESFI safety guidance. If you smell burning or see scorch marks, shut off the circuit and follow our electrical emergency guide.