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Electrical Wire and Cable

Wiring Electrical Control Relays

motor-relay ©Copyright
Summary: How to wire control relays for equipment such as Generators, Air Conditioners, Heating Furnace, and other high demand equipment. Full explanation describing the principles which are easily adapted to residential wiring applications.

Introduction to the Basics of Electrical Relays

A relay contactor is a large relay, usually used to switch current to an electric motor or other high-power load.

Large electric motors can be protected from overcurrent damage through the use of overload heaters and overload contacts.

If the series-connected heaters get too hot from excessive current, the normally-closed overload contact will open, de-energizing the contactor sending power to the motor.

More about

Control Relays and Contactors

How Electrical On-Delay Staging Relays Work

This section will cover the use of relays that are sometimes needed to control special device loads such as Air Conditioners and other high demand equipment from starting at the same time.

Electrical Relay Construction and Purpose - Part 1

This section will cover how relays are constructed and operate due to the current flowing through the control coil and the mechanical reaction that takes place.

Electrical Relay Construction and Purpose - Part 2

This section will cover the use of electrical relays contactors and how they are wired and function in a motor control application.

Electrical Relay Construction and Purpose - Part 3

This section covers time-delay relays and how they can be constructed to delay armature motion on coil energization, de-energization, or both.

Electrical Relay Construction and Purpose - Part 4

This section explains how protective relays are used to monitor the current, voltage, frequency and more in the electrical power industry.

Electrical Relay Construction and Purpose - Part 5

This section will discusses the limitations of solid state relays due to contacts, size and operation speed.


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