Generally, this is due to overloaded circuits, weak breakers or defective breakers.
- A circuit breaker is rated to protect a defined ampacity; exceeding the rated ampacity may cause "tripping" of breakers.
- Breakers with a continuous heavy load or a load close to the circuit breaker rated value can stress the internal workings of the breaker and weaken the trip mechanism. This is a common cause of nuisance tripping and circuit breaker replacement and/or re-circuiting is recommended.
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Circuit breakers can fail and I have yet to find an item that has never had a manufacturer's defect. We check for that!

