This Schneider Electric Harmony 9001K modular red push-button has 2 positions, operates with spring return mechanism. It has a round shape with 57mm mushroom head. It fits in a 30mm hole. It has a chromium-plated metal bezel. This 57mm mushroom shaped push-button headis 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 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.