Activities Manual For Programmable Logic Controllers
Activities Manual For Programmable Logic Controllers
5th Edition
ISBN: 9781259682476
Author: Frank Petruzella
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 6, Problem 4RQ

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Difference between contractors and relays:

ContactorsRelays
A contactor is an electromagnetic device that is used to make or break any electrical circuit.A relay is an auxiliary contractor used in control circuit, for as a digital input or output to switch on or off an electrical contractor.
Contactors are special relays that are used for high power applications...

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