The utility model relates to an
interlocking mechanism of a permanent
magnet ring main unit, which comprises a support frame and a support frame, the support frame is provided with a mounting hole, a driving shaft is arranged in the mounting hole, one end of the driving shaft extends outwards and is provided with a
cam, and the other end of the driving shaft is connected with a transmission shaft of a permanent
magnet circuit breaker through a coupler. Two guide pins are arranged on the outer side of the supporting frame and located below the driving shaft, an
interlocking sliding plate is installed on the two guide pins in a sliding mode,
kidney-shaped holes are formed in the positions, corresponding to the two guide pins, of the
interlocking sliding plate so that the interlocking sliding plate can slide in the vertical direction, and a reset tension spring is installed between the inner side of the interlocking sliding plate and the supporting frame. A top plate is arranged at the top end of the interlocking sliding plate corresponding to the
cam, and a locking part is arranged at the lower end of the interlocking sliding plate and used for shielding an operation shaft of the isolation mechanism; according to the utility model, interlocking between the permanent magnetic mechanism and the isolation mechanism of the permanent magnetic ring main unit is realized, and the
operation safety is improved.