How to wire a Relay

How_to_Wire_a_Relay.pdf

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

Transcript:

[0m:4s] Hi I'm Josh Bloom, welcome to another video in the RSP Supply education series. Today we're going to be talking about how to wire a relay. Now, for more information about how a relay actually functions, please see our other videos. We will link in the description below for those.
[0m:18s] For today's purpose we're going to be wiring an AC relay, or that means that the coil is rated for AC voltage. In this case, we have a two pole relay which essentially means we have two separate relays, or each poll allows us to control two circuits.
[0m:38s] Each circuit is either a normally open or normally closed circuit. So, a two pole double throw relay. Again, the double throw means we have both the option for they normally open and normally closed contact.
[0m:52s] So, to wire a relay, there are several different terminations that we need to make.
[0m:57s] We need to terminate to our coil which allows the relay to open and close, we need to wire each pole, the pole being the common wire, and we need to wire to either both or one or the other that normally opened and normally closed side of a contact, in this case, in a double throw relay.
[1m:17s] The first thing we need to wire is the coil. In this case, we have a 120 Volt AC relay. So we need to provide AC power to our coil. In most relays, the coils are going to be labeled A one and A two. In an AC relay, this can be interchangeable. Let me show you how we make this connection. I first take my hot wire I'm going to terminate that into the A one portion of this relay.

[1m:42s] I will then take my neutral wire and make the connection on the A two portion of the relay.