The invention relates to the technical field of switches, in particular to a self-resetting
overvoltage and undervoltage protection switch which comprises a first shell, a circuit board, an armature sheet, a coil
assembly and a permanent
magnet assembly, the circuit board is arranged in the middle of the interior of the first shell and comprises a first control
chip and a second control
chip, and the armature sheet is arranged in the position, close to the top of the first shell, of the interior of the first shell. The armature sheet is located on the upper portion of the circuit board, the coil
assembly is arranged in the middle of the interior of the first shell and close to the right side of the first shell, a movable contact assembly of the coil assembly makes contact with a static contact of the armature sheet, and the movable contact assembly comprises a movable
contact shell, a movable contact body, a first spring, a connecting rod, a
threaded rod and a motor. The permanent
magnet assembly is arranged in the middle of the interior of the first shell and close to the right side of the first shell, and the permanent
magnet assembly is arranged on the right side of the coil assembly. According to the self-resetting over-
voltage and under-
voltage protection switch, the motor pushes the
threaded rod so as to push the connecting rod and compress the first spring, the movable contact body is pushed to move forwards, and the loss part of the movable contact is compensated to complete contact with the static contact.