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English definition of “circuit breaker”

circuit breaker

noun [C]  /ˈsɜr·kət ˌbreɪ·kər/ us  
a safety device that stops the flow of current to an electrical system: I cut off all the circuit breakers in the house, but I could still hear a humming sound.
(Definition of circuit breaker from the Cambridge Academic Content Dictionary © Cambridge University Press)
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