This Harmony XB4, projecting black 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 -40°C to 70°C allows versatility in usage of product.