Breakers trip for three reasons, and the reason is the repair. Overload: the circuit is asked for more than its rating, classically a space heater and a hair dryer discovering each other; the fix is load management or a new circuit, not a bigger breaker, because the wire in the wall is the rating that matters. Fault: a short or a ground leak, reported by instant tripping. Wear: the breaker itself, which confesses by tripping under light load or feeling warm.
In Los Gatos a tripping breaker gets sorted by neighborhood before it gets sorted by cause. Downtown, the pattern is usually era and load: an original service asked to run a modern house. In the hills, add the restoration surge after a shutoff, when every motor on the road restarts at once and tired breakers confess. Reset once, note what was running, and let the pattern, not the frustration, write the service call.
The safe home tests are few and they end early: unplug everything on the circuit, reset, and add loads back one at a time. If it trips empty, stop testing; the fault is in the wiring or the breaker, and both are a technician's meter work. Note which appliances were running at the trip; that list is half the diagnosis and the technician will ask for it.
What never to do: hold a breaker on, tape it, or swap in a larger breaker to stop the nuisance. The tripping is the protection working. Every electrical fire investigation that starts with a defeated breaker ends the same way, and the breaker was the cheapest part of the house it was protecting.
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