# Three Phase Contact Relay Wiring

By | April 3, 2023

## Three Phase Contact Relay Wiring: A Comprehensive Guide

Three-phase contact relays are used to control the flow of electricity in three-phase circuits. They are typically used in industrial applications, such as motor control, power distribution, and lighting. This article will provide a comprehensive guide to three-phase contact relay wiring. We will cover the basics of three-phase circuits, the different types of three-phase contact relays, and how to wire them correctly.

### What is a Three-Phase Circuit?

A three-phase circuit is an electrical circuit that uses three alternating currents of equal magnitude, frequency, and phase offset. The three currents are arranged in a star or delta configuration. The star configuration is the most common type of three-phase circuit. In a star configuration, the three phases are connected to a common point called the neutral. The delta configuration is less common, but it is sometimes used in applications where high power is required.

### Types of Three-Phase Contact Relays

There are two main types of three-phase contact relays: normally open and normally closed. Normally open relays are energized when the coil is de-energized, and normally closed relays are energized when the coil is energized. Normally open relays are used to connect or disconnect a load when the coil is de-energized. For example, a normally open relay could be used to start a motor when the power is turned on. Normally closed relays are used to disconnect a load when the coil is energized. For example, a normally closed relay could be used to stop a motor when the power is turned off.

### Wiring a Three-Phase Contact Relay

Wiring a three-phase contact relay is relatively simple. The following steps will show you how to wire a normally open relay: 1. Connect the load to the contacts of the relay. 2. Connect the common terminal of the relay to the neutral of the three-phase circuit. 3. Connect the three phase terminals of the relay to the three phases of the circuit. 4. Connect the coil of the relay to a voltage source. When the coil is energized, the contacts of the relay will close and connect the load to the circuit. When the coil is de-energized, the contacts of the relay will open and disconnect the load from the circuit.

### Troubleshooting Three-Phase Contact Relays

If a three-phase contact relay is not working properly, there are a few things you can check to troubleshoot the problem. First, check the wiring to make sure that it is correct. Make sure that the load is connected to the contacts of the relay and that the coil is connected to a voltage source. Second, check the coil of the relay to make sure that it is working properly. You can do this by using a multimeter to measure the resistance of the coil. The resistance should be between 50 and 100 ohms. If the coil is not working properly, you will need to replace it. Third, check the contacts of the relay to make sure that they are not stuck. You can do this by gently prying them open with a small screwdriver. If the contacts are stuck, you will need to clean them or replace them.

### Conclusion

Three-phase contact relays are an essential component of many industrial applications. By following the steps in this guide, you can easily wire a three-phase contact relay and troubleshoot any problems that may arise.

* [Three-Phase Contact Relays](https://www.electricaleasy.com/three-phase-contact-relays/) * [How to Wire a Three-Phase Contact Relay](https://www.electricaleasy.com/how-to-wire-a-three-phase-contact-relay/) * [Troubleshooting Three-Phase Contact Relays](https://www.electricaleasy.com/troubleshooting-three-phase-contact-relays/)

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