How do auxiliary contacts work?

Auxiliary contacts are additional contacts used in conjunction with a primary switch or relay to provide additional control or indication functions. They operate in synchronization with the main contacts, either opening or closing alongside them as the primary device is activated or deactivated. These contacts can be normally open (NO) or normally closed (NC) and are commonly used in control circuits to signal the status of the primary device or to control other devices in a system. Their versatility allows for more complex control schemes and automation in electrical systems.