Schneider Electric ZB4FA334 Flush mounted push button head, Harmony XB4, metal, white, 30mm, spring return, marked UP ARROW. This 30.5 mm push-button head provides an ergonomic interface for controlling your machine. 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 its clear color and marking. It is vibration resistant, impact resistant, high pressure washer resistant and dust resistant thanks to its IP69 protection, making it ideal for operation in harsh environments. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Head for non-illuminated push-button; Device short name: ZB4F; Bezel material: Chromium plated metal; Mounting diameter: 30.5 mm; Sale per indivisible quantity: 1; Head type: Built-in-flush; 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.