This Harmony XB4, illuminated 40mm mushroom white button head operates with a spring return / impulse mechanism. This illuminated 40mm mushroom shape push button head for integral LED is ideal for situations where quick actions are required for a process or machine to function correctly or where operator movements require maximum ergonomy. It is easily combined with Harmony range of contact blocks to perform a large variety of control functions. It is clearly distinguishable visually at a distance thanks to its illuminated head. 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. The clear boot prevents growth of bacteria in joints and gaps, it makes this product ideal for high hygiene environments. Its highly ergonomic mushroom push button shape makes it ideal for use in area where operator wear thick gloves or where users have impaired movements.