Electricity: Relays, Contactors and Starters (Module 7)

A relay is an electrical switch. It opens and closes under the control of a separate electrical circuit. This topic will explain the workings of a relay.

This course is intended to provide students and practicing technicians with safety information and knowledge related to personal protective equipment. This course is not intended as a sole source of training for HVACR technicians.

CEH 3   CEU 0.3

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