The utility model belongs to the technical field of medium-
high voltage switches, and discloses a medium-
high voltage quick
circuit breaker, which comprises a static contact, a moving contact and an operating mechanism connected with the moving contact in a
vacuum arc-extinguishing chamber, and the operating mechanism comprises a repulsive force mechanism comprising a rechargeable opening coil and a rechargeable closing coil, the repulsive force disc is arranged between the two parts and is pushed by electromagnetic force generated after the two parts are electrified respectively; the permanent
magnet mechanism comprises a permanent
magnet, a permanent
magnet coil, a static iron core wrapping the permanent magnet and the permanent
magnet coil, and a movable iron core capable of moving up and down relative to the permanent magnet, and electromagnetic force generated by positive and negative
electrification of the permanent
magnet coil eliminates or strengthens magnetic force of the permanent magnet, so that the movable iron core is far away from or close to the permanent magnet; and the driving shaft penetrates through the repulsive force mechanism and the permanent magnetic mechanism and synchronously moves up and down along with the repulsive force disc and the movable iron core so as to push the movable contact and the static contact to be switched on or switched off. According to the
circuit breaker, electromagnetic repulsive force driving is combined with permanent magnet, so that the switching-on and switching-off speed is high, no bounce during switching-on is ensured, and the
fault rate is extremely low.