Do-it-Yourself Electrical Relay Basics
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Summary: This section will cover the use of relays that are sometimes needed to control special device loads such as Generators, Air Conditioners and other high demand equipment. The content is explained through industrial controls but the principles can be easily adapted to residential wiring applications as well. |
Introduction to the Basics of Electrical Realys |
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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. |
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More about Electrical Relay Basics |
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Electrical Relay On-Delay Relay Application for Air Conditioning & Energy Savings 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 Part 1: Relay construction 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 Part 2: Contactors This section will cover the use of electrical relays contactors and how they are wired and function in a motor control application. Electrical Relay Part 3: Time-delay relays This sectiopn covers time-delay relays and how they can be constructed to delay armature motion on coil energization, de-energization, or both. Electrical Relay Part 4: Protective relays This section explains how protective relays are used to monitor the current, voltage, frequency and more in the electrical power industry. Electrical Relay Part 5: Solid-state relays This section will discusses the limitations of solid state relays due to contacts, size and operation speed. |
