A gapless metal-oxide surge arrester comprises of the following main components:
The internal parts can differ considerably between a porcelain-housed arrester and a polymer-housed arrester. The only certain commonality between these two designs is that both include a stack of MO resistors connected in a series, together with the components to keep the stack together. The MO resistors themselves consist of approximately 90% zinc oxide and 10% of other rare earth oxides which, during the manufacturing process, are formed into a dense ceramic body with varistor properties.
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