Schneider Electric ZB4BC680 Head for push button. Harmony XB4. pushbutton harsh environment. dark blue. without marking. This Harmony XB4, flush blue button head operates with a spring return / impulse mechanism, is used in harsh environment. This button head provides an ergonomic interface for controlling your machines. It is easily installed and replaced on compatible complete push button units and contact blocks via snap-fit assembly. It is clearly distinguishable visually at a distance thanks to clear color. 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. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product. Harmony XB4. pushbutton harsh environment. dark blue. without marking in the Harmony XB4 range. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Head for push-button; Device short name: ZB4; Bezel material: Chromium plated metal; Head type: Standard; Mounting diameter: 22.5 mm; Sale per indivisible quantity: 1; Cap/operator or lens colour: Blue. 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.