Schneider Electric XB4BW73731M5 Illuminated double-headed push button, metal, Ø22, 1 green flush I + 1 pilot light + 1 red projecting O, 240 V AC, 1 NO + 1 NC. This Harmony XB4 illuminated double head has 1 green, 1 red button and 1 central white pilot light, operates with a spring return / impulse mechanism. It has a metal bezel. It is marked with "I" and "O" symbols. This double-head button provides a complete 2 button interface to your machines with a single panel cut-out. It is easily installed into a standard 22mm diameter cut-outs and connected with simple screw-clamp connections. Its schematic is clearly distinguishable thanks to illuminated clear colors and markings, minimizing errors during initial wiring and later maintenance operations. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66/IP67/IP69/IP69K and IP69K, making it ideal for operation in harsh environments. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Illuminated double-headed push-button; Device short name: XB4; Bezel material: Chromium plated metal; Head type: Standard; Mounting diameter: 22.5 mm; Colour of marking: Black marking when white caps White marking when green, red or black caps; Light source: Protected LED. Harmony XB4 devices use a chromium-plated metal bezel and are designed for robust panel operation where clear manual control, indication or machine safety interfaces are required.