These Limit Switches are used for E. O. T. Cranes, wagon shunting devices etc to prevent over travel or traverse on power & control circuit upto 500 V. A. C, 50 cycles/second. When used as shunt limit switch the maximum permissible frequency of operation is 1000 operations per hour.
The Limit Switch normally remains closed and cuts off power to stop the motor of the crane. The Limit Switch operates when it reaches a predetermined position when the lever is moved over a projecting member fixed on the girder.