![]() Rarely, a final operating device will be directly controlled by the contacts of an industrial limit switch, but more typically the limit switch will be wired through a control relay, a motor contactor control circuit, or as an input to a programmable logic controller. The class of Proximity Switches operates by the disturbance of an electromagnetic field, by capacitance, or by sensing a magnetic field. ![]() ![]() A reed switch may be used to indicate proximity of a magnet mounted on some moving part. Limit switches may be directly mechanically operated by the motion of the operating lever. Standardized limit switches are industrial control components manufactured with a variety of operator types, including lever, roller plunger, and whisker type. They are used for control of a machine, as safety interlocks, or to count objects passing a point. Limit Switch is a switch operated by the motion of a machine part or presence of an object.
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