LIMIT SWITCHES
 
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Manufacturers available:  Carlo Gavazzi, Omron, and others.
A limit switch is a switch operated by the motion of a machine part or presence of an object.  They are used for controlling machinery as part of a control system, as a safety interlocks, or to count objects passing a point. A limit switch is an electromechanical 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.