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Wiring Electrical Control Relays
By Dave Rongey
Summary: Wiring Electric Relays to Control HVAC Heating and Air Conditioning Equipment. 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.
© By: Dave Rongey
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.
Control Relays and Contactors