What are switches?
Switches refer to 'electrical components that turn electrical circuits ON and OFF.'
Types of Switches
Switches are broadly divided into two types.
Switches used to turn circuits ON and OFF manually
Switches used to turn circuits ON and OFF using an object
Basic Contact (Circuit) Arrangement
Form A contacts
(normally open contacts):
N.O. (Normally Open) contacts
Contacts that normally open (OFF state) and
close (turn ON) the circuit when actuated
Form B contacts
(normally closed contacts):
N.C. (Normally Closed) contacts
Contacts that normally close (ON state)
and open (turn OFF) the circuit when actuated
Form C contacts
Transfer contacts (a combination of Form 1A
and Form 1B contacts)
Transfer contacts with both Form A and
Form B contact functions