Miniature circuit breaker

The invention relates to the technical field of electrical elements, in particular to a miniature circuit breaker, and aims to solve the technical problems of complex structure and cumbersome layout of a double-breakpoint small circuit breaker in the prior art. The miniature circuit breaker comprises a shell, a moving contact assembly, two static contacts, two wiring terminals, arc extinguishing mechanisms, an operating mechanism and a thermomagnetic protection mechanism; the moving contact assembly is located on the lower portion of the shell, a moving contact frame is rotationally installed on the shell, and two moving contacts are installed on the left side and the right side of the moving contact frame respectively; the two static contacts are suitable for being matched with the moving contacts to achieve on-off of the circuit breaker, and the static contacts are fixed in the shell and located on the sides, away from the moving contact frame, of the moving contacts; the two wiring terminals are both fixed