Mechanical force overload protector

The utility model relates to a mechanical force overload protector which comprises a shell, a stress displacement mechanism is arranged in the shell and comprises a moving block capable of moving in the horizontal direction, the upper side, corresponding to the moving block, of the shell is rotationally connected with a sector gear, and one end of the moving block can abut against the end, away from teeth, of the sector gear. The side, corresponding to the sector gear, of the shell is rotationally connected with a rotating shaft, the rotating shaft is fixedly connected with a gear, the sector gear is meshed with the gear, the end, away from teeth, of the sector gear is fixedly connected with a tension spring arranged on the shell, the side, corresponding to the gear, of the rotating shaft is fixedly connected with a supporting plate, and a mercury switch is installed on the supporting plate. A lead for controlling connection and disconnection of a circuit is mounted on the mercury switch; and a pointer for in