Front element for push button Harmony ZB4F. Lens black, text - unlabeled. Design - protruding, with detent, without indicator light. Mounting diameter 30.5 mm. With high vibration resistance and chemical resistance, ambient temperature -40 to +70 degrees C. Chrome-plated metal, 1,000,000 cycles. Certifications - UL listed, CSA. Product standards - CSA C22.2 No 14, EN/IEC 60947-5-1, EN/IEC 60947-5-4, UL 508, EN/IEC 60947-1, JIS C 4520. Protection class up to IP69K.