HIGH CURRENT VACUUM CIRCUIT INTERRUPTER WITH CONTACTS HAVING BERYLLIUM ARCING PORTIONS

摘要

A vacuum-type circuit interrupter comprises a pelf 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.