This Schneider Electric Harmony XB4 40mm mushroom black button head operates with latched push-pull mechanism. It has a round shape and a chromium-plated metal bezel. This 40mm mushroom shaped push-button head 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 a prominent 40mm mushroom shape. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66, making it ideal for operation in harsh environments.