VACUUM CIRCUIT BREAKER Russian patent published in 1997 - IPC

FIELD: electrical engineering; high-voltage equipment for switching and protecting load circuits. SUBSTANCE: circuit breaker has vacuum arc-control chamber with break gap 16, contact spring 15, switching shaft 1 with lever 2 joined with break gap through trip-free mechanism. EFFECT: provision for disconnecting power mechanism from contact system for off-operation period thereby making contact breaking speed independent of kinematic system of power mechanism and dependent only of characteristics of spring. 2 dwg