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SPST 4 Way 40A 12V Relay Wiring Pin-Out Diagram

What is a relay?
As an electrical control device, the relay is in fact an "automatic switch" that controls the operation of a large current through a small current, so that it has functions of automatic regulation, safety protection as well as circuit conversion. Many automobile and motor devices need a relay to control the circuit, such as led work light, fog lamps, starter, wiper, fans, speakers, central locking, alarm, electric windows, etc. 

Related Product: SPST 4 Way Relay 40A 12V DC with Wiring Harness for Car Applications

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