noun
Technical term used in electrical engineering and everyday contexts for a device that interrupts an electric circuit to prevent overload or short circuits.
回路遮断機が落ちたので、ブレーカーを上げてください。
The circuit breaker tripped, so please reset the breaker.
More common colloquial term for a circuit breaker, often used in homes. 回路遮断機 is the formal technical name.
Compound of 回路 (circuit), 遮断 (interruption), and 機 (device). A straightforward modern technical term.