Front element for selector switch Harmony ZB4F. Front black. Up to IP69K. Mounting diameter 30.5 mm. With high vibration resistance and chemical resistance, ambient temperature -40 to +70 degrees C. Chrome-plated metal, 2 positions 90°. Certifications BV, LROS (Lloyds register of shipping), DNV, UL listed, CSA, RINA, GL. Standards JIS C 4520, EN/IEC 60947-5-1, EN/IEC 60947-5-4, EN/IEC 60947-1, CSA C22.2 No 14, EN/IEC 60947-5-5, UL 508.