Schneider Electric ZB4BW363 Illuminated push button head, metal, flush, blue, Ø22, spring return, plain lens integral LED. This Harmony XB4, plain lens illuminated flush blue button head for universal LED operates with a spring return / impulse mechanism. This illuminated button head for universal LED provides a versatile interface for controlling your machines. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Head for illuminated push-button; Device short name: ZB4; Product compatibility: Universal LED; Bezel material: Chromium plated metal; Head type: Standard; Mounting diameter: 22.5 mm; Sale per indivisible quantity: 1. 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.