Patent ID: 7764481
Filing Date: 2010-07-27
Classification: H01T,H02H

Abstract:
1. An overvoltage protective device with one or more discharge tubes and one or more clamping type overvoltage protective components, the overvoltage protective device comprising: three or more discharge units connected in series; and two or more clamping type overvoltage protective units connected in parallel to the discharge units except one or more of the discharge units, wherein the overall operating voltage of the discharge units connected in parallel to all the clamping type overvoltage protective units is lower than any voltage obtained by subtracting from the operating voltage of each clamping type overvoltage protective unit, the spark-over voltages of the other discharge units connected in parallel to the clamping type overvoltage protective unit, and at the same time higher than the operating voltage of each discharge unit connected in series to any one of the clamping type overvoltage protective units.