Auxiliary contactor blocks

Auxiliary contact

 

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An auxiliary contact or auxiliary contactor is an electromechanical component used in conjunction with switching devices, such as contactors, relays, to control electrical circuits and installations. Auxiliary contacts extend the properties of a control relay or contactor by extending the range of current they can control as well as the number of contacts they can control.

 

Auxiliary contacts attach to the main contacts, the controlling electrical device, and change their state with it. The connection between the auxiliary contact and the relay or contactor is made by the logic controller, which in turn issues commands to switch the electrical loads on or off. Auxiliary contacts are designed for DIN rail or bracket mounting, and offer different numbers and types of contacts using screw or spring terminals. They are in different designs, number of contacts, with different range and load capacity according to current and voltage. Contacts can be open or closed (NO and NC).