The external air-gap surge arrester is engineered to protect overhead distribution systems against lightning and switching surges. Its simple yet robust design combines a zinc oxide varistor core with an externally exposed spark gap, delivering reliable overvoltage protection and a clear visual indicator of operation.
Suitable for harsh outdoor environments, this arrester resists pollution and moisture while preventing follow current through its self-extinguishing air gap. Quick, tool-free installation and maintenance-free operation make it an efficient solution for distribution networks and pole-mounted transformers.
