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.

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