![]() So as you can see below, L1 goes down into a normally closed switch. Just like basic house wiring, we always want to control (switch) the hot wire. Let's say were using household voltage in this circuit which is 110/120 Vac. In this example we are simply turning on a light. This diagram will show you how simple it is to control motors, lights, valves, other relays and any type load you want. See my Switch Terminology Page for more on contact arrangements if you need to.īy looking at the diagram below we can go through the basic concept of a relay and how they operate. So when wiring up these relays, the coil wire's will connect to pins 2 & 7 on the socket. ![]() As you can see, there is absolutely no difference between the square type and the round type other than the ratings on the relay. This pinout image is only a 2-pole diagram for room on the page purposes, but you can get the picture here with this one since a 3-pole will just have 1 more set of contacts. The square relay pinout shows how the relay socket is configured for wiring.
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