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What is an electronic relay? - 2008 Volkswagen Passat Sedan

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A device used to transmit power to a motor or component, without sending that high power through the switch itself, which would burn out the switch in a short time. The switch is used to energize the relay so the power can be transmitted through the relay to the component.
A relay has two sides to it-the power side and the coil side. When the coil side is energized, say by the switch turning on, it causes the power side of the relay to connect the high power source to the wire going to the component or motor. Automakers use several relays throughout the car and its electrical circuits.

Posted on Dec 06, 2012


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