A circuit breaker is a device used to interrupt or break an electrical circuit when an overload condition exists and so to protect electrical equipment. Unlike a fuse, it is not destroyed in operation and can be re-closed (re-set). A circuit breaker is usually installed in the positive circuit. Circuit breakers on transmission lines are controlled by precise relays that locate failures and cause only the needed breakers to operate, thus isolating a specific section.
Related category• ELECTRICITY GENERATION AND SUPPLY
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