How to Wire a Relay

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AC

Double Pole, Double Throw

Wiring the coil

On AC relay the Hot and Neutral are interchangeable

Consider the color that you are using

Make sure that the wire is sized correctly (what the current rating is of the wire)

Wire to NO and NC.

You don’t need to wire to both if it is not needed

Acting as switch

Make sure when wire to properly torque the connections, and not to allow any fraying of the wire which might cause a short circuit

DC

Single Pole, Double Throw

Wiring the coil

On DC relays, it is important to know that the coil has to be wired in the correct method. They conductors cannot be interchanged.

Consider the color that you are using

Make sure that the wire is sized correctly (what the current rating is of the wire)

Wire to NO and NC.

You don’t need to wire to both if it is not needed

Acting as switch

Make sure when wire to properly torque the connections, and not to allow any fraying of the wire which might cause a short circuit

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