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Noun
surge suppressor
surge protector
spike suppressor
spike arrester
lightning arrester
Definition: electrical device inserted in a power line to protect equipment from sudden fluctuations in current
Definition: A device used on electrical and telecommunications systems to protect the insulation and conductors from the damaging effects of lightning. Typically, it has a high-voltage terminal and a ground terminal. When a surge travels along the power line to the arrester, the current from the surge is diverted through the arrester, in most cases to earth.