What is the purpose of an auxiliary switch in a circuit breaker?

An auxiliary switch in a circuit breaker serves the critical function of providing remote indication of the breaker main contact position. This means that when the circuit breaker is either open or closed, the auxiliary switch can send a signal, such as a status indication to a control system or panel, allowing operators to monitor the state of the breaker from a distance.

This capability is essential for both operational efficiency and safety, as it allows operators to know the condition of the circuit without needing to inspect the physical breaker directly. This remote indication feature enhances situational awareness, especially in complex electrical systems where multiple breakers may be present, and helps ensure that systems remain operational and safe.

In contrast, disconnecting circuits in emergencies or controlling the flow of electric current are functions associated with the main contacts of the circuit breaker itself. Moreover, enhancing protection against current overloads typically involves protective relays and circuit breaker settings rather than the auxiliary switch, which is focused more on status indication.