This Harmony XB4, projecting blue button head operates with a spring return / impulse mechanism. This button head provides an ergonomic interface for controlling your machines. It is easily combined with Harmony range of pushbuttons and contact blocks to perform a large variety of control functions. It is clearly distinguishable visually at a distance thanks to 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 -40C to 70C allows versatility in usage of product.