Schneider Electric ZB4BG03 Head for key selector switch, Harmony XB4, black key, 22mm, 3 positions, left center key withdrawal, key 455. This Harmony XB4, black head with key (key no.455) for key selector switch has 3 positions, operates with stay-put mechanism with key withdrawal on left and center position. This head with key provides a versatile interface for controlling your machines. It is easily installed and replaced on compatible complete key selector switch units to provide 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. 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. Secure machine and system operation with a key, only available to authorized operators. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Head for key selector switch; Device short name: ZB4; Bezel material: Chromium plated metal; Mounting diameter: 22 mm; Head type: Standard; Sale per indivisible quantity: 1; Shape of signaling unit head: Round. Harmony XB4 devices use a chromium-plated metal bezel and are designed for robust panel operation where clear manual control, indication or machine safety interfaces are required.