Front element for selector switch Harmony ZB4F. Black front, long knob, not lockable. 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 LROS (Lloyds register of shipping), DNV, BV, RINA, CSA, GL, UL listed. Standards UL 508, EN/IEC 60947-1, EN/IEC 60947-5-5, CSA C22.2 No 14, EN/IEC 60947-5-1, EN/IEC 60947-5-4, JIS C 4520.