Limit switches use the mechanical movement of the actuator plunger to control or change the electrical switch's state. When an object (sometimes called the target) comes in physical contact with the actuator, the actuator plunger’s movement results in the electrical contacts within the switch to either close (for a normally open circuit) or open (for a normally closed circuit) their electrical connection. How does a limit switch work?Ī standard limit switch used in industrial applications is an electromechanical device that consists of a mechanical actuator linked to a series of electrical contacts. It was at this point that the switch was engaged to control the limit of travel. The original use for limit switches, as implied by their name, was to define the limit or endpoint over which an object could travel before being stopped. Limit switches are used to automatically detect or sense the presence of an object or to monitor and indicate whether the movement limits of that object have been exceeded. Image credit: mofaez/ What are Limit Switches? Limit switches are contact switches used to detect objects and control machines.
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