PS21S-NS1109-T00 is a safety-type limit switch designed for monitoring and protection of industrial machines. It features a metal body with IP66 degree of protection, a 1/2" NPT cable gland (N), S11 (1NO+1NC) snap action contact block, and a fully turnable head (09). The switch conforms to EN 50047 standards and IEC 947-5-1 (EN 60947-5-1), with positive opening operation for enhanced safety. Key electrical specifications include a thermal current rating (Ith) of 10A and rated insulation voltage (Ui) of 500V. This limit switch is ideal for use on sliding or pivoting protectors such as covers, doors, and grids, providing operator protection by immediately stopping machine drives when the protector is opened.