The construction of a micro switch is really simple. The main parts of the switch are:
6.NO terminal: normally open
7.NC terminal: normally closed
After a micro switch makes physical contact with an object, its contacts change position. The basic working principle is as follows.
When the plunger is in the released or rest position.
The normally closed circuit can carry current.
The normally open circuit is electrically insulated.
When the plunger is depressed or switched.
The normally closed circuit is open.
The normally open circuit is closed.