HIGH CURRENT VACUUM CIRCUIT INTERRUPTER WITH CONTACTS HAVING BERYLLIUM ARCING PORTIONS

摘要

ABSTRACT OF THE DISCLOSUREA vacuum-type circuit interrupter comprises apelf of separable contacts having arcing portions betweenwhich arcs are formed upon disengagement of said contacts.These arcing portions are of a material consisting essentiallyof beryllium formed from a vacuum-cast ingot that has beensubjected to hot working by extrusion to produce a micro-structure characterized by grains much smaller on the averagethan the grains of the as-cast ingot.