Surge protector(surgeProtection device) also known asSurge arrester, hereinafter referred to as 50/60 hz (SPD) is suitable for communication, rated voltage 380 v power supply system (or) communication system, the indirect lightning and thunder and lightning directly affect transient over voltage surge protection, or other applicable to the family home, the third industry and surge protection requirements of industrial field, has the relative phase, contrast, relative to the midline, midline of protected mode and their combination, etc.

The most primitive surge protectors, known as the ram horn gap, appeared in the late 19th century and were used for surge protectionOverhead transmission lines, to prevent lightning damage to equipment insulation and power failure. In the 1920s, aluminum surge protectors, oxide film surge protectors and pill surge protectors appeared. The 30 s saw the advent of tubular surge protectors. In the 1950sSilicon carbideLightning protection device. Metal oxide surge protectors were introduced in the 1970s. Modern high voltage surge protectors are used not only to limit the over-voltage caused by lightning in power system, but also to limit the over-voltage caused by system operation.