Telemecanique XALK178 Emergency Stop Push Button

The Telemecanique XALK178 Emergency Stop Push Button is a complete surface-mounted emergency stop control station built around a 40 mm red mushroom-head pushbutton with turn-to-release operation and one normally closed contact for emergency stopping of industrial machinery. A Harmony XALK family device, it is compatible with Harmony XB5 Ø22 mm control and signaling units and is commonly installed on conveyors, packaging lines, machine tools, and other production equipment where a reliable emergency stop is required. The enclosure is polycarbonate with a yellow cover (RAL 1021) and light gray base (RAL 7035), IP66-rated to protect the control components in demanding environments, and it uses screw-clamp terminals for secure wiring. It supports surface mounting and provides multiple cable-entry options: 1 × 14 mm knockout and 2 × Pg13/M20 knockouts (up to 12 mm). Key specifications include rated insulation voltage 600 V, mechanical durability 300,000 operating cycles, operating temperature -25 °C to +70 °C, and adherence to IEC 60947-5-1, UL 508, and CSA C22.2 No. 14. Function: Emergency stopping of industrial machinery. Common replacements include Schneider Electric XALK178 and Telemecanique XALK174; part number XALK178. Weight: 0.194 kg.