Simple Relay Wiring Diagram. In this example we are simply turning on a light. By looking at the diagram below we can go through the basic concept of a relay and how they operate.
The relay remembers which switch was pressed last. The diagram above is the 5 pin relay wiring diagram. There are different kinds of relays for different purposes.
Rung 4 contains one nc contact and one pilot lamp.
Rung 4 contains one nc contact and one pilot lamp. Rung 3 contains one no contact and one pilot lamp. 4 pin normally open relay with the switch on the positive side of the control circuit. In this circuit rung 1 contains one push button initially off and one control relay.