The Circuit Keeps Tripping: A Decision Tree

Why this matters

A breaker or fuse that keeps tripping is doing its job. It is protection reacting to a real problem, not a nuisance to be ignored. The dangerous move is to "fix" it by resetting harder, swapping to a bigger breaker, or jamming in a heavier fuse. That defeats the only thing standing between a fault and a fire. The right approach is to read what kind of trip it is, because overload, short circuit, and ground fault each leave a different signature and each points to a different repair.

Start here: how does it trip?

The timing and pattern of the trip is your first and best clue.

• If it trips after running a while, or only when more load is added: think overload. Too much current for too long, on a circuit that is otherwise healthy.
• If it trips instantly, the moment you reset or energize: think short circuit or hard ground fault. A dead short trips immediately and hard.
• If it trips on a GFCI or AFCI device, sometimes with no obvious heavy load: think ground fault (current leaking to ground) or arc fault (a damaging arc), which those devices specifically watch for.
• If it trips randomly with no pattern: think intermittent fault, a loose connection arcing, or a failing breaker.

Overload branch

The circuit is carrying more current than its rating allows, sustained.

1. Add up the load. Are too many things on one circuit, or did someone add a big load? Measure total current draw against the breaker rating.
2. Check for a degraded load pulling more than it should. A failing motor, a binding pump, or a load running on low voltage all pull excess current (see the current-draw article).
3. Fix the load, not the breaker. Move some load to another circuit or repair the part drawing too much. Never upsize the breaker to match an overload; the wiring is rated for the original size.

Short-circuit branch (instant trip)

A hot conductor is touching neutral or another hot directly. Almost no resistance, huge current, instant trip.

1. De-energize and verify dead. You are now hunting a bolted fault.
2. Isolate by halves. Disconnect loads and devices on the circuit, then reset. If it holds with everything off, reconnect one section at a time until it trips. The section that trips it contains the short.
3. Inspect for the classic causes: a pinched or nicked cable, a wire crushed under a screw, water in a box, a damaged cord, a failed component shorting internally, a back-stabbed connection that worked loose and shorted.

Ground-fault and arc-fault branch (GFCI/AFCI trips)

• GFCI trips: current is leaking to ground somewhere, even a small amount. Moisture in a box, a deteriorated cord, a motor or heater with a winding leaking to its frame, or a wiring error. Test loads one at a time on the protected circuit to find the leaker. Around water (pools, spas, wet locations) treat every ground-fault trip as a real shock hazard, not a nuisance.
• AFCI trips: the device detected an arcing signature, often from a loose connection, a damaged conductor, or a worn cord arcing. Find and remake the bad connection.
• Do not "solve" a repeated GFCI/AFCI trip by replacing it with an ordinary breaker. That removes the protection and leaves the fault live.

Intermittent and "the breaker itself" branch

• If the trip is random and load checks out: suspect a loose connection arcing under load (find it with the voltage-drop and heat methods) or a breaker that has weakened from repeated tripping and now nuisance-trips below its rating. A breaker that has tripped many times can fatigue; replace it after ruling out a real fault.
• Never assume "bad breaker" first. The breaker is usually right. Prove the circuit is clean before you blame the protection.

The rule that keeps people safe

Match the protection to the wire, never the wire to the load. If a circuit keeps tripping, the answer is to reduce or repair the load and the wiring, not to raise the trip point. Upsizing protection to stop nuisance trips is how electrical fires start.

References

• NFPA 70 (National Electrical Code) - overcurrent protection, GFCI and AFCI requirements.
• OSHA 29 CFR 1910 Subpart S - safe electrical work and de-energization.
• Manufacturer documentation - breaker ratings and device-specific reset behavior.
• See related: Measuring Current Draw Against the Rating, Voltage Drop, Grounding: The Why and the Quick Check.