Metal Oxide varistor is the core of the arrester, which main component is Zinc Oxide and with a small quantity of bismuth oxide, Metal Oxide varistor is the core of the arrester, which main component is Zinc Oxide and with a small quantity of bismuth oxide, fluoride oxide, manganous carbonate, antimony oxide and other gleam of additive and made with high temperature. Metal Oxide Varistor's ...