HIGH CURRENT VACUUM CIRCUIT INTERRUPTER

摘要

A vacuum-type circuit interrupter rated to interrupt currents of 30,000 amperes r.m.s. and highercomprises a pair of separable contacts having arcing portions between which arcs are formed upon disengagement of said contacts. These arcing portions are of a material consisting essentially of beryllium formed from a vacuum-cast ingot that has been subjected to hot working by extrusion to produce a microstructure characterized by grains much smaller on the average than the grains of the as-cast ingot.