Front element for push button Harmony ZB4. Front black, cover chrome-plated metal, arrow pointing downwards. Lettering A. Dimensions (WxHxD) 29x29x28 mm, mounting diameter 22 mm. White symbols embedded in the touch surface. 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 according to RINA, DNV, LROS (Lloyds register of shipping), CSA, GL, BV, UL listed. Product standards according to EN/IEC 60947-5-4, JIS C 4520, CSA C22.2 No 14, EN/IEC 60947-1, UL 508, EN/IEC 60947-5-5, EN/IEC 60947-5-1.