What is a shunt trip breaker?

A shunt trip breaker is a type of circuit breaker that includes a mechanism for remotely tripping the breaker. This mechanism, known as a shunt trip device, allows the circuit breaker to be tripped from a distance, either manually or automatically.

Shunt trip breakers are commonly used in commercial and industrial settings where it may be necessary to remotely disconnect power to a circuit in the event of an emergency or other critical situation. For example, they are often used in elevator systems, where they can be tripped remotely to safely bring the elevator to a stop in the event of a malfunction.

The shunt trip device is typically connected to an external control signal, such as a switch or relay, which can be activated to trip the breaker. When the control signal is activated, it causes a magnetic coil in the shunt trip device to release, which in turn trips the circuit breaker.

Overall, shunt trip breakers provide an added level of safety and convenience in certain applications where remote tripping capability is necessary.