The invention discloses a
floor type circuit breaker electric propulsion mechanism, which comprises a gear box fixed on a
floor type circuit breaker, a lead screw which passes through the center of the gear box and a
clutch box which is fixed on the static car
fixed frame and penetrated by the lower end of the lead screw, wherein the gear box is provided with a gear nut which forms a trapezoidal thread screw
assembly with the lead screw, and a motor gear is meshed with the gear nut in the gear box; a chuck plate is provided in a
clutch box port; the center of the chuck plate is provided with a rotating
keyhole; the lower part of the lead screw in turn passes through the top of the
clutch box, the rotating
keyhole at the center of the chuck plate and the static car
fixed frame; the lead screw which is arranged in the clutch box is matched with a limit sleeve; the lead screw at the position in which a
kidney-shaped hole is formed in the lead screw is glidingly arranged with a
cam. A spring is connected between the top of the
cam and the limit sleeve; the
cam can be clamped in the rotating
keyhole at the center of the chuck plate under the action of the spring. The
floor type circuit breaker electric propulsion mechanism meets the requirements of modern power grids such as
miniaturization,
automation, intelligence and high reliability on switchgears.