Portable miniature circuit breaker

The utility model discloses a portable miniature circuit breaker. Bottom plate, an upper shell is clamped on the upper surface of the bottom plate; a balance wheel is rotationally installed in the middle of the rear wall of the upper shell. A shifting handle is integrally formed at the upper end of the left end of the balance wheel; a permanent magnet is clamped at the lower right corner of the balance wheel; the lower end of the balance wheel is integrally formed with a balance piece, a transition contact piece is clamped at the lower end of the balance piece, one end of a tension spring is hooked to the upper middle portion of the balance wheel, the other end of the tension spring is hooked to the front wall of an upper shell, an electromagnetic coil is clamped on the right portion in the upper shell, and wire connectors are clamped at the lower ends of the left outer wall and the right outer wall of the upper shell. When the short-circuiter is used, a hole is formed in an integratedfacility, and then the i