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Panasonic Home Business > Industrial Devices > Automation Controls Top > Introduction to Automation Controls > Introduction to Switches - What are Switches?



What is a switch?

What are Switches?

Simply Put, a Switch is

an "Electrical Part to Turn Eclectic Circuits ON or OFF".
ON imageOFF image

Types of Switches

Broadly speaking, there are "two types" of switches.

Manual Operation Switch
A switch that is turned on or
off manually.
Detection Switch
A switch that is turned on or
off by an "object"
(Examples)
  • A switch to turn on or off lighting
  • A switch to turn on or off a television
  • A switch to turn on or off a copier
(Examples)
  • A switch that detects the sold out status of a vending machine
  • A switch that detects the limit position of a UFO catcher
  • A switch that detects the monitor position of a video camera up or down
  • A switch that detects whether the door of a copier is opened or closed

Basic Configuration of Connection (Circuit)

a contact (Normally open contact) image

a contact
(Normally open contact)
N.O. (Normally Open) contact

A contact that is normally open (OFF state)
and connect a circuit (turn ON) when it operates

b contact (Normally closed contact) image

b contact
(Normally closed contact)
N.C. (=Normally Closed) contact

A contact that is normally closed (On state)
and opens a circuit (turn OFF) when it operates

c contact (Transfer contact) image

c contact (Transfer contact)
Transfer contact (combination of 1a
contact and 1b contact)

A contact that has the functions of both a and
b contacts