Circuit breaker
Circuit breaker turns up in 2 fields: electrotechnology, electricians. Here is what it means to the people in each one.
Circuit breaker in electrotechnology
A mechanical switching device capable of making, carrying and breaking currents under normal and fault conditions.
A heavy-duty switch designed to automatically interrupt power when it detects an overload or short circuit. Unlike a fuse that melts and must be replaced, a circuit breaker uses magnetic or thermal mechanisms to trip open the contacts and can be reset once the fault is cleared. In power systems, they range from small molded-case units to massive high-voltage gas-insulated tanks that extinguish arcs using SF6 or a vacuum.
"The main circuit breaker tripped on overcurrent, so we need to test the downstream cables before resetting it."
Circuit breaker in electricians
An automatic, resettable switch that protects an electrical circuit from damage caused by excess current.
A circuit breaker monitors the current flowing through a branch circuit and automatically breaks the connection if it detects an overload or a short circuit. Inside, a bimetallic strip bends under sustained excess heat to trip the mechanism, while an electromagnet provides instant tripping for sudden, massive faults. Once tripped, it can simply be flipped back to the on position, unlike a one-time fuse.
"Go down to the main panel and see if the circuit breaker for the air compressor tripped again."