Direct current circuit breaker

A direct current circuit breaker comprising:

• first breaking circuitry including a first circuit breaker inserted in a direct current line and a resonance circuitry to generate a resonance current, and configured to form a current zero point by superimposing the resonance current on a direct current flowing through the direct current line, and break the direct current by opening the first circuit breaker;
• and
• second breaking circuitry including a semiconductor element connected in series to the first circuit breaker, and configured to allow the direct current to flow when energization of the semiconductor element is ON, and break the direct current by switching energization of the semiconductor element from ON to OFF, wherein
• the first circuit breaker is connected in parallel to the resonance circuitry to form a first parallel connection body in which the first circuit breaker and the resonance circuitry are connected in parallel to each other,
• the first breaking circuitry include a second circuit breaker inserted in the direct current line and connected in series to each of the first circuit breaker and the resonance circuitry, and
• the semiconductor element is connected in parallel to the second circuit breaker to form a second parallel connection body in which the semiconductor element and the second circuit breaker are connected in parallel to each other,
• the first parallel connection body and the second parallel connection body are connected in series to each other.