1) A circuit breaker will not reset if breaker is hot, or if there is a short to ground.
2) Hot breaker: If circuit is pulling more amps than the breaker rating, or if breaker is loose on the busbar, then breaker gets hot, and trips.
3) Volts x amps = watts. Add up wattage of everything on breaker and divide by 120Volts and that gives you amps.
If your breaker is 15 amps, the SAFE maximum is 80% or 12 amps.
4) If breaker is loose, you can smell burning and hear crackling sound. Jiggle the breaker around and listen for crackling.
http://waterheatertimer.org/How-to-replace-circuit-breaker.html5) If there was a short somewhere on the breaker circuit, the breaker will trip.
When you unpluged each device and then the breaker was reset, then that says problem is probably NOT the wiring or breaker.
The problem was probably inside one of the devices that was plugged in.
6) If breaker trips again, unplug each device one at a time, and then try to reset breaker after each unplug to see if you can isolate suspected device.
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