A
surge arrester is a device to protect electrical equipment from over-voltage transients caused by external (lightning) or internal (switching) events. Also called a
surge protection device (SPD) or
transient voltage surge suppressor (TVSS), this class of device is used to protect equipment in power
transmission and
distribution systems. (For consumer equipment protection, different products called
surge protectors are used.) The energy criterion for various insulation material can be compared by
impulse ratio, the surge arrester should have a low impulse ratio, so that a surge incident on the surge arrester may be bypassed, to the ground instead of passing through the apparatus.