The following image shows the 5 Pin Relay Wiring Diagram where relay pins 87A & 30 are closed when the relay coil is not active, and the switch turns on either relay. At the same time, another relay supplies ground to the motor via 87A to 30 connections. Just as the wiring diagram represents, you can use such a 5 Pin Relay for an alarm system using multiple diodes. You can use EdrawMax Online to create such wiring diagrams. EdrawMax is equipped with all the diagramming elements required to create and share such writing diagrams. From free electrical wiring templates to over 50,000 vector symbols, this electrical engineering diagram maker is recommended for beginners and professionals alike.