A limit switch is an electro-mechanical device that consists of an actuator mechanically linked to a set of contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection. Limit switches are used in a variety of applications and environments because of their ruggedness, simple visible operation, ease of installation and reliability of operation.

Used in applications which need a limit to connect/disconnect contacts, it comes in two types Snap Action/ Normal Action.

Best instance of Limit Switch's application is Lifts or Elevators.

The unit is Oil Tight and made of very sturdy Aluminum housing. Contacts used are silver allows.