This illuminated 40mm mushroom shape push button head for integral LED is part of of the range diameter 22mm, Harmony XB4. It is ideal when quick actions are required. It fits for a process or machine to function correctly or where operator movements require highest 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 makes it ideal for operation in harsh environments.