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Auxiliary contacts can sometimes be referred to as electromechanical devices, they are used in conjunction with primary switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are physically connected to the main switching equipment and work at the same time. The add-on accessories are available in a range of contact configurations and mounting styles to suit a wide range of industrial control applications.
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So what is an auxiliary contact and how does it work? Auxiliary contacts are affixed to the main contacts and they pass the data from the circuit to a logic controller, which in turn gives instructions to the linked devices about whether to turn on or off. Alternatively, they can be used as a standalone hardware control unit. One of the most common uses for this type of component is for a push-button controller, where they can be built into the start button.