A micro switch, also known as miniature snap action switch, is a type of momentary contact switch used widely in automotive, industrial and medical instruments as sensor.  The switch is termed as “micro” on the name of the company who first started manufacturing it commercially. The actuator of these switches often has a hinged wheel placed above a push button. This switch is widely used in control system applications such as a door interlock, safety switches in elevators, vending machines etc. Having a diverse range of engineering applications, micro switches are available in various switch configurations, housing materials, actuator styles etc.