What is the purpose of an auxiliary contact in switchgear?

The purpose of an auxiliary contact in switchgear is to provide additional circuit functions, such as alarms or signals. Auxiliary contacts are not involved in carrying the main load; instead, they serve to enhance the functionality of the primary switching device. For instance, when a circuit breaker or switch opens or closes, the auxiliary contacts can actuate alarm systems to alert operators of the circuit's status or facilitate control functions in different parts of the system.

These contacts play a vital role in automating and monitoring electrical systems, ensuring that operators have real-time information about the operation of switchgear. They help provide a more comprehensive functionality without impacting the primary circuit. This makes them crucial for safety and operational efficiency in power systems.