| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small-sized circuit breaker having a high breaking performance by increasing a capacity of a capacitor part configuring a resonance circuit part and by miniaturizing the capacitor part. <P>SOLUTION: A circuit breaker has: a main contact 11 inserted in a DC circuit 1 provided between a DC power supply 20 and a load 30; and a resonance circuit part connected in parallel to the main contact 11, the resonance circuit part in which a coil 13 and a capacitor part 14 are connected in series. An oscillating current generated at an arc A of the main contact 11 and the resonance circuit part at the time of current breaking is superimposed on a DC current to generate current zero to a current flowing in the main contact 11 and perform the current breaking. The capacitor part 14 has two sets of circuits in each set of which an aluminum electrolytic capacitor 15 and a diode 16 are connected in parallel so that a positive electrode of the aluminum electrolytic capacitor 15 and a cathode of the diode 16 are connected with each other. The two sets of circuits are connected in series so that the same poles of the aluminum electrolytic capacitors 15 are connected with each other. <P>COPYRIGHT: (C)2013,JPO&INPIT |
