Schneider Electric ZB4BZ141 Single contact block with body/fixing collar, metal, screw clamp terminal, 1 NO + 2 NC. This Harmony XB4, single contact block is pre-assembled on a body/collar fixing unit. It has 1 x NO + 2 x NC contacts and a chromium-plated metal bezel. Official Schneider characteristics include Range of product: Harmony XB4; Product or component type: Complete body/contact assembly; Device short name: ZB4; Fixing collar material: Zamak; Sale per indivisible quantity: 1; Head type: Standard; Contacts type and composition: 1 NO + 2 NC; Contact operation: Slow-break. 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.