Schneider Electric ZB4BD29 Head for selector switch, Harmony XB4, XB5, black Ø22 mm 2 position stay put. This Harmony XB4, black selector switch head with knurled knob has 2 positions, operates with stay-put mechanism. This switch head with knurled knob provides an ergonomic interface for controlling your machines. It can easily be installed on compatible selector switch units and provide an effective manner to set your machine in various operating modes. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP69K. 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. 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 selector switch; Device short name: ZB4; Bezel material: Chromium plated metal; Mounting diameter: 22 mm; Sale per indivisible quantity: 1; Head type: Standard; 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.