The most primitive surge protector, the claw-shaped gap, appeared in the late 19th century and was used in overhead transmission lines to prevent power outages caused by lightning strikes damaging equipment insulation. In the 1920s, aluminum surge protectors, oxide film surge protectors, and pill surge protectors appeared. Tubular surge protectors appeared in the 1930s. Silicon carbide lightning arresters appeared in the 1950s. Metal oxide surge protectors appeared in the 1970s. Modern high voltage surge protectors are used not only to limit the overvoltage caused by lightning in the power system, but also to limit the overvoltage caused by the operation of the system. Since 1992, the industrial control standard 35mm rail snap-on pluggable SPD lightning protection module represented by Germany and France has been introduced to China on a large scale, and later the integrated box-type power supply lightning protection combination represented by the United States and Britain also entered China.