A power relay is a switch that uses an electromagnet to open or close a circuit. The basic design of a relay utilizes an electromagnet coil, an armature, a spring and one or more contacts. If the power relay is designed to normally be open, the circuit is not completed when in the off state. To Satisfy the needs of the customer, we provide Power Relays of the highest quality at the most competitive price. Get the best price of the Power Relays.