breaker

break|er /br'eɪkə^r/ (breakers)
[N-COUNT]
Breakers are big sea waves, especially at the point when they just reach the shore.
see also ice-breaker, law-breaker, strike-breaker, strike-breakercir|cuit break|er (circuit breakers)
also circuit-breaker
[N-COUNT]
A circuit breaker is a device which can stop the flow of electricity around a circuit by switching itself off if anything goes wrong.
There is an internal circuit breaker to protect the instrument from overload.