Answer what you can see below. This ranks the likely causes, gives you one safe next check, and tells you clearly when to stop and call a licensed electrician.
Stop and call a licensed electrician or emergency services now if there's smoke, sparks, a burning smell, heat, shock, or water near the problem. Otherwise it's safe to answer the questions below.
What can you see?
Diagnosis
Example result — change the answers on the left and the ranking updates for your situation.
Most likely cause
Overload — the continuous load is above what the breaker allows (about 80% of its rating), so it heats up and trips
Ranked by fit to your answers
1
Overload — the continuous load is above what the breaker allows (about 80% of its rating), so it heats up and trips
80
SAFE NEXT CHECKMove some of the load to another circuit. Continuous draw should stay under about 80% of the breaker (12 A on a 15 A, 16 A on a 20 A). Resetting onto the same overload just trips again.
Where to stop. Resetting a breaker once is homeowner-safe. A breaker that keeps tripping is protecting against a real fault or overload — do not repeatedly reset it, and never tape, wedge, or oversize it. Opening the panel and any wiring repair is a licensed electrician's job. This is general information, not a quote and not a substitute for a licensed electrician.
Rule trace — why this ranking
Estimated load ≈ 20 A exceeds about 80% of a 15 A breaker (12 A), so it heats and trips under load. +80
What to do next
Try the safe next check above. If it doesn't resolve the problem — or if sorting it out would mean opening a panel, touching wiring, or anything past a simple visual check — stop and call a licensed electrician. Don't replace parts on a guess.
Not your exact situation? Change any answer above and the ranking updates — or try a related situation below.
code NEC 210.12 — Arc-fault protection · verified 2026-06-20
code NEC 240 — Overcurrent protection (do not oversize) · verified 2026-06-20
manufacturer Breaker manufacturer trip-curve and application notes · verified 2026-06-20
Named standards and manufacturer guidance, re-verified on a freshness schedule. When a source cannot be re-verified, the dependent rule is suppressed rather than asserted.
Can I just put in a bigger breaker to stop the tripping?
No. The breaker is sized to protect the wire behind it. A larger breaker lets the wire overheat before tripping, which is a fire risk. Fix the overload or fault instead, and have an electrician size any change.
It trips the second I flip it back on with nothing plugged in. What does that mean?
An instant trip with no load is a short or hard fault — the breaker is doing exactly its job. Leave it off and have the circuit traced; continuing to reset it stresses everything in the fault path.
The breaker only trips when the AC or a power tool starts. Is it bad?
Often it's startup inrush — motors pull a big surge for a moment. Try the appliance on a different circuit; if it trips that one too, the appliance is the problem. If only this breaker trips on modest loads, the breaker may be weak.
Electrical Fault Check provides general diagnostic information only. It is not professional advice, not a quote, and not a substitute for a licensed electrician. Do not work on live wiring. If you see smoke, sparks, burning smell, heat, shock, water exposure, or repeated tripping, stop using the circuit and contact a licensed electrician or emergency services as appropriate.