Operating mechanism for high-voltage circuit-breakers

An operating mechanism for actuating an operating rod (13) of a circuit-breaker comprising at least one interrupter chamber filled with a pressurized dielectric gas, said rod passing through an end flange (1B) of the circuit-breaker, to which said rod is sealed, said operating mechanism comprising:

• a tripping spring (21) held charged when the circuit-breaker is closed by a selectively operable tripping abutment (23),;
• and
• a resetting system comprising a closed and sealed enclosure (32) communicating with a pressurized interrupter chamber via a first pipe (40) that can be closed off by a valve (41) and via a second pipe (50) in which there is disposed in series a vacuum pump (51), the resetting system further comprising a resetting member (34) sliding within said enclosure, to which said resetting member is sealed, and spring loaded towards the inside of the enclosure by a spring (31), said resetting member being associated with a selectively operable resetting abutment (43), said resetting member being disposed on the axis of said rod (13), said resetting abutment member (43) being adapted to allow resetting of the circuit breaker without impeding a subsequent tripping operation.