DC BREAKER DEVICE

A direct-current breaking device (1) includes a main circuit breaker (12) inserted on a DC line (24), a resonant circuit (30) connected in parallel with the main circuit breaker, and a MOSA (2) connected in parallel with the main circuit breaker via the resonant circuit. The resonant circuit includes first, second, third, and fourth switching elements (4, 5, 6, 7), a capacitor (3), and a reactor (16). A first circuit unit (32) including the first switching element and the second switching element connected in series with each other, and a second circuit unit (33) including the third switching element and the fourth switching element connected in series with each other are connected in parallel. The capacitor is connected between a connection point (34a) of the first switching element and the second switching element and a connection point (34b) of the third switching element and the fourth switching element to constitute a bridge circuit (31). The bridge circuit and the reactor are connected in series with each other.