This Schneider Electric Harmony 9001K black key operated selector switch with E cam has 2 positions and operates with a stay-put mechanism. The key can be withdrawn on left and right position. It fits in a 30mm hole. It has a chromium-plated metal bezel. This key operated selector switch provides a versatile interface for controlling your machines. It is easily installed into a standard 30mm diameter panel cut-outs and provides a secure manner for authorized staff to switch between process or machine operating modes. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66, making it ideal for operation in harsh environments.