The XB4BS8442 is an emergency switching off push-button from the Harmony XB4 range, designed for safety-critical machine control. It features a robust, chromium-plated metal construction with a 40mm red mushroom head and mounts in a standard 22.5mm panel cutout. The operator uses a trigger action and mechanical latching, with a turn-to-release reset mechanism. This unit includes one slow-break normally closed (1 NC) contact with silver alloy material, rated for a conventional thermal current of 10 A and an insulation voltage of 600 V. With high IP ratings (IP66, IP67, IP69, IP69K) and a mechanical durability of 300,000 cycles, it is built for reliable performance in demanding industrial environments.