This Harmony XB4 plain lens illuminated modular green push button operates with a spring return / impulse mechanism, is supplied with 220V to 240V AC, uses an integral transformer with Integral LED. It has a metal bezel. This illuminated push button with integral transformer provides an ergonomic and visual interface for controlling your machines. It is easily installed into a standard 22mm diameter cut-outs and connected to control circuits with classic screw-clamp connections. It is clearly distinguishable visually at a distance thanks to a bright and long lasting BA9s base and LED illumination. 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.