A limit switch is an electromechanical device used to detect the presence or absence of an object, or to monitor and control the movement of a machine. When an object comes into contact with the actuator of the switch, it triggers the switch to change its state, which can either open or close an electrical circuit.

Key Components:

  • Actuator: The part that physically comes into contact with the moving object.
  • Contacts: These are the electrical connections inside the switch that either make (close) or break (open) the circuit when the actuator is engaged.
  • Housing: Encloses and protects the internal components of the switch.

Common Uses:

  • Position Sensing: Detects the position of a machine component.
  • Safety Applications: Stops a machine or activates a safety mechanism if a dangerous condition is detected.
  • Control Systems: Used to limit the travel of moving parts in machines, ensuring they do not exceed a predetermined range.