Definitions from Wiktionary (lightning arrester)

▸ noun:  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.
▸ Also see lightning_arrester


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