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A limit switch is an electromechanical device used in electrical circuits to detect the presence or absence of an object or motion. It is typically used in industrial machinery and other mechanical applications as a safety device to prevent accidents and damage to equipment.

Limit switches have a small actuator arm that is triggered when an object comes into contact with it. The switch will then either open or close the circuit based on the position of the actuator arm. This allows for precise control over machinery and helps prevent damage from unexpected movement or collisions.

Limit switches come in different types, including lever switches, plunger switches, and roller switches. They can be used in various applications, such as in elevators, conveyors, and other types of automated machinery. They are an essential component for ensuring safe and efficient operation of industrial equipment.