What is a relay?

A relay is an electromechanical switch that opens and closes circuits electronically and electromechanically. It controls circuit contacts, with states changing when electrical energy is supplied. When the relay contact is open (NO), the relay is not energized. If closed (NC), it remains unenergized with the closed contact. Electrical energy supply changes these states.

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Find the differences between Electrical Relays and Contactors!