Front element for push button Harmony ZB4. Front black, cover chrome-plated metal, O. Dimensions (WxHxD) 29x29x33 mm, mounting diameter 22 mm. Mechanical life 1,000,000 cycles. Head shape round, standard. With high vibration resistance and chemical resistance, ambient temperature -40 to +70 degrees C. The modular metal program with 22 mm installation dimension combines easy installation, efficiency and modern design. Certifications listed according to UL, BV, RINA, GL, CSA, LROS (Lloyds register of shipping), DNV. Product standards according to EN/IEC 60947-5-5, UL 508, EN/IEC 60947-1, JIS C 4520, EN/IEC 60947-5-1, CSA C22.2 No 14, EN/IEC 60947-5-4.