AUTOMATIC CIRCUIT BREAKER Russian patent published in 1998 - IPC

FIELD: electrical engineering; short-circuit protection of electric circuits. SUBSTANCE: circuit breaker has insulating case as well as fixed contacts, movable contacts rigidly joined together on main insulating shaft for rotary motion, at least one overcurrent release, trip-free mechanism, arc-control chambers; all these components are provided in each pole of circuit breaker. Disconnecting rack has flat and cylindrical springs secured on clamp rigidly coupled with transfer gear; clamp is provided with additional member in the form of lip to prevent firing of cylindrical spring. EFFECT: improved safety in operation. 2 cl, 5 dwg