This Harmony XB4, recessed high guard blue button head operates with a spring return / impulse mechanism. This button head provides a robust and ergonomic interface for controlling your machines thanks to its recessed high guard head. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly and is clearly distinguishable visually at a distance thanks to its clear color. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.