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Zinc oxide ZnO the arrester is one kind of new arrester which in the 70s' developed, it mainly constituted by the zinc oxide varistor. Each varistor from make has its certain switching voltage (to call varistor), (i.e. is smaller than under the normal working voltage presses sensitive voltage) The varistor value to be very big, is equal to the state of insulation, but (is bigger than under the striking potential function presses sensitive voltage), the varistor assumes the low value to penetrate, is equal to the short circuit condition. However the varistor is struck the condition, is may restore; After being higher than presses the sensitive voltage the voltage cancellation, it regained the high-resistance condition. Therefore, like installs the zinc oxide arrester after the power line, when is struck by lightning, the thunder electric wave's high voltage causes the varistor puncture, the thunder and lightning to circulate the varistor inflow earth, causes on power line's voltage control in the margin for safety, Thus has protected the electric appliance equipment's security.

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