The D4B4113NNPT is a safety limit switch designed to provide certified direct opening operation within a robust metal housing. This model is configured with an M20 conduit, a 1NC/1NO snap-action switch, and a resin roller lever actuator. A key safety feature is the direct opening mechanism on the normally closed (NC) contact, which ensures contact separation even in cases of contact welding. The switch is built for harsh environments, offering an IP67 degree of protection and a wide operating temperature range from –40 to 80°C. Certified to UL, CSA, EN (TÜV), and CCC standards, it is ideal for applications requiring reliable position detection and safety interlocking on industrial machinery.