Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit.
Relay is a device that works based on electromagnetic to move a number of arranged contactors or an electronic switch that can be controlled from other electronic circuits by utilizing electric power as its energy source. Contactor will be closed (on) or open (off) because of the effect of magnetic induction generated by the coil (inductor) when electric current is flowed. Unlike the switch, contactor movement (on or off) is done manually without the need for electric current.
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