Introduction And Analysis Of Three Other Types Of Surge Protectors

Voltage-limiting type surge protective device: Its operating principle is to provide high impedance when there is no transient overvoltage. However, as surge current and voltage increase, its impedance decreases, and its current-voltage characteristics are strongly nonlinear. Devices used in this category include zinc oxide, varistors, suppressor diodes, and avalanche diodes.

Shunt type surge protector: Connected in parallel with the protected equipment, it presents low impedance to lightning pulses and high impedance at normal operating frequencies.

Choker type surge protection device: Connected in series with the protected equipment, it presents high impedance to lightning pulses and low impedance at normal operating frequencies.