The XB4BT842 is a complete emergency stop push-button from the Harmony XB4 range, designed for safety-critical machine control. It features a trigger action with mechanical latching, a push-pull reset, and a 40 mm red mushroom head on a chromium-plated metal bezel. The unit is equipped with one normally closed (1 NC) slow-break contact and utilizes screw clamp terminals for secure connections. Built for high durability, it offers a mechanical lifespan of 3,000,000 cycles and an electrical durability of 1,000,000 cycles under specified AC-15 loads. Its robust construction provides IP66, IP67, and IP69K ratings, making it suitable for harsh industrial environments and applications requiring high-pressure washing resistance.