The invention discloses a miniature
circuit breaker with a novel zero-sequence
transformer installation structure. The miniature
circuit breaker comprises an
intelligent control module, a first
circuit breaker and a second circuit breaker which are sequentially arranged side by side, wherein the first circuit breaker comprises a first shell, an electric leakage protection module arranged in the first shell, a first incoming line terminal, a first outgoing line terminal and a zero line wiring board, one end of the zero line wiring board is connected with the first incoming line terminal, the other end of the zero line wiring board penetrates through the electric leakage protection module and is connected with the first outgoing line terminal, the electric leakage protection module is connected with the
intelligent control module, the second circuit breaker comprises a second shell, a
current transformer arranged in the second shell, a second incoming line terminal, a second outgoing line terminal and a live line wiring board, one end of the live line wiring board is connected with the second incoming line terminal, the other end of the live line wiring board sequentially penetratesthrough the second shell, the first shell, the electric leakage protection module and the
current transformer and is connected with the second outgoing line terminal, and the
current transformer is connected with the
intelligent control module. The miniature circuit breaker aims to optimize the structure of the circuit breaker, reduce the cost and decrease the volume.