This Harmony XB4 modular blue push button operates with a spring return / impulse mechanism. It has a metal bezel. This push button provides a simple and robust control to machines and processes. It is easily installed into standard 22mm diameter cut-outs and connected with simple screw-clamp connections. Its schematic is clearly distinguishable visually at a distance thanks to 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, making it ideal for operation in harsh environments.