Low voltage vacuum switch with plural conic shields about the contacts

摘要

An improved low voltage vacuum switch is detailed which is operable to interrupt high D.C. continuous currents at voltages below the arc potential. An improved arc shield is provided which ensures that the switch can withstand significant D.C. overvoltages across the contacts when the switch is in the open position, even after repeated switch operation. The arc shield means comprises spaced-apart generally conic shield extending in parallel relationship from opposed ends of the switch with substantial overlap of the conic shields. These conic shields are disposed at an angle relative to the switch axis and minimize the chance for vaporized contact material to reach and condense upon the switch insulator body portion.