See also: circuit-breaker
- (electrical engineering) An electrical switch capable of opening and closing an electrical circuit in all operating conditions, including fault situations.
- 2019 October, Roger Ford, “Power failure highlights specification confusion”, in Modern Railways, page 27:
- Typically traction packages monitor the supply frequency and if it strays outside pre-set limits open the circuit breaker between the pantograph and the transformer to shut off the power.
- VCB (vacuum circuit breaker)