Working Principle Classification Of Surge Protector

Based on their operating principles, surge protective device devices can be categorized as voltage switching, voltage limiting, and combination types. The third level, surge protector, protects against residual lightning energy that passes through the second-level protector. Depending on the voltage rating of the protected equipment, if two levels of lightning protection can limit the voltage to below the equipment's withstand voltage, only two levels of protection are required. If the equipment's withstand voltage is lower, four levels, surge protection device, or even more, may be required.