| 摘要 |
A circuit breaker for breaking a distribution cable is provided to improve a sensitivity. The circuit breaker comprises: a circuit(10) for transforming an waveform to reverse the output signal of a load circuit(9); a first multiplexer(11); an amplifying transformer(13); a second multiplexer(14) for selecting the current; a sampling part(15) for sampling the full-wave rectified waveform; a microcomputer(6) for processing the data of an A/D converter(5); and a short sensing circuit(18) for driving a relay part(17) before the microcomputer(6) is start-on when over-current is generated.
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