An auxiliary switch or contact is an electrical switch actuated by a main device (such as a circuit breaker) for signaling or interlocking. It is used to remotely indicate the position of the main circuit breaker contacts, whether open or closed. In addition to indicating position, they can also be used to control relays, indicator lights, and other accessories. Most control systems require auxiliary devices to completely implement the desired control sequence. This is true whether the control system is electric, analog electronic, or digital. More generally, an auxiliary device serves as a secondary or supplemental backup to the primary component.
In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electro-mechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching, current can pass between them, while when the contacts are separated no current can flow.
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