PLC: Switches, Circuits, and Basic Functions--Relays--Contractors and Overloads
Part 5 of the Switches, Circuits, and Basic Functions Series defines relays, and their components, and how they can change the nature of a circuit system.
Coil of wire that magnetizes pulling switches closed
Coil has low current
Contacts have current rating
Explain why relays are used – current loads
1000’s of relays in use
Show relays we have
Time delay relays
Multipole once had a square D with 20 poles we were in awe
Maybe show Contactors and overloads.