Surge voltage arrestor with ventsafe feature

Abstract From the Canadian patent

Abstract of the Disclosure, A surge voltage arrester assembly for protecting telephone lines comprises a primary gas tube surge arrester and an air gap secondary arrester that provides surge protection should the gas tube become vented to atmosphere. The secondary arrester has the air gap defined by a rim of one of the gas tube electrodes and a metallic cup into which the gas tube is positioned. In a three element version of the invention wherein the gas tube has two line electrodes and a ground electrode metallic cups are, provided at opposite ends of the gas tube to cooperate with the ground electrode for forming secondary air gaps for each line electrodes. An O-ring and a sealing …