Patent ID: 6950295

Claim:
A method of assembling an overvoltage protection device for use with a pair of signal lines such that the capacitive unbalance between the signal lines introduced by the overvoltage protection device is less than a predetermined first value, the method comprising the steps of: determining the capacitance of each MOV in a group of MOVs, each MOV in the group being capable of protecting against a voltage surge; sorting the MOVs into at least one subgroup consisting only of MOVs with capacitances that differ by no more than a predetermined second value; and assembling the overvoltage protection device using MOVs selected only from the same subgroup so that the capacitive imbalance of the overvoltage protection device does not exceed the first value, wherein the first value is about 1.3 picofarads and the second value is about 1.0 picofarad.