Nc 4 Pin Relay Wiring Diagram

How to test a four terminal relay.

Nc 4 pin relay wiring diagram. In other words when the relay control coil is not energized the relay switch contacts are closed completing the circuit through pins 2 and 4. In this video i show you how to wire a 12 volt automotive bosch style relay. If the 2 lines are depicted as meeting at the circle or dot the relay is a normally closed nc. Or dot the relay is a normally open no relay.

Relay logic provides you with a guide for using ncd relay controllers and how they can be wired for many types of applications. You will notice that on the type b layout pins 86 and 30 are swapped over compared with the type a layout. These layouts are shown on the two 5 pin relays below pin 87a not present on 4 pin relays. Place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay.

The type b layout is arguably easier to work with as the connected terminals are in line making the wiring easier to visualise. Relay logic is all about wiring up relays for logical switching applications. Multimeter used in video. Here is a video on how you can test a relay with or without a diagram.

Normally closed relays the operation of a normally closed relay is the same to that of a normally open relay except backwards. This page demonstrates several simple ways to wire a relay for various applications.