The PS21R-NT11N7-YK0 is a pull-wire safety limit switch designed for emergency stop functions in industrial machine protection. It features a robust IP66-rated metal body with a thermoplastic head, a 1/2 NPT cable inlet, and a manual reset button. The switch includes 1NO+1NC slow action contacts with positive opening operation, a conventional enclosed thermal current of 10A, and a rated insulation voltage of 400V. This device is suitable for applications requiring a wire length between 6m and 15m, providing reliable operator protection by immediately stopping machine drives.