Zinc oxide varistor disk Low leakage current Over voltage protection Approved UL, CSA, VDE ... , lightning protection, inrush current, the absorption peak pulse, limiting high-pressure arc, noise reduction, the role of protecting the semiconductor components ... ≥ 30Voltage ratio:V1ma/V0.1ma ≤ 1.08 Zinc Oxide Varistor Disk Zno Varistor zov-20D821K (7D 10D 14D 20D )