A Limit switch is triggered by mechanical motion of any object.
It is basically an Electromechanical switch whose actuator is mechanically linked to contacts set. They are cheap and reliable devices which can by easily installed.
There are four possible combinations:
- Normally open
- Normally closed
- Held open
- Held closed
All these four configurations with symbols are shown below:
Don’t know How it works?
Check out this amazing video by Process Control Solutions: