A direct current circuit breaker which uses a charged capacitor to produce a reverse current to cut off a fault current, comprising: a main circuit line which is connected between a power supply and a load, wherein the main circuit line includes a main breaker; a charging circuit line which is disposed in the rear stage of the main breaker and is connected in parallel to the load, wherein the charging circuit line includes a first capacitor, a reactor and a second diode connected in series in this order, and the second diode is disposed to direct from the rear stage of the main breaker to a rear stage of the load; a switch line having one end connected in parallel to the front stage of the main breaker and the other end connected between the reactor and the second diode, characterized in that the main circuit line further includes a first diode connected in parallel with the main breaker, wherein the first diode is disposed to allow a current to flow from the load to the anode of the power supply; that the switch line includes a third diode and a current switch connected in series, wherein the third diode is disposed to direct from the front stage of the main breaker to a rear stage of the current switch; and that the main circuit line further includes an auxiliary breaker and a current limiting reactor connected in series at a front side of the main breaker, wherein the auxiliary breaker is configured to be opened when the fault current flowing through the main breaker reaches a current zero point, thereby removing a remaining current flowing via the switch line and wherein the current limiting reactor is provided to prevent mechanical and thermal hindrance of the circuit due to a current flowing when the circuit is shorted and reduce a required capacity of the breaker by limiting a current to be cut off. a main circuit line which is connected between a power supply and a load, wherein the main circuit line includes a main breaker; a charging circuit line which is disposed in the rear stage of the main breaker and is connected in parallel to the load, wherein the charging circuit line includes a first capacitor, a reactor and a second diode connected in series in this order, and the second diode is disposed to direct from the rear stage of the main breaker to a rear stage of the load; a switch line having one end connected in parallel to the front stage of the main breaker and the other end connected between the reactor and the second diode, characterized in that the main circuit line further includes a first diode connected in parallel with the main breaker, wherein the first diode is disposed to allow a current to flow from the load to the anode of the power supply; that the switch line includes a third diode and a current switch connected in series, wherein the third diode is disposed to direct from the front stage of the main breaker to a rear stage of the current switch; and that the main circuit line further includes an auxiliary breaker and a current limiting reactor connected in series at a front side of the main breaker, wherein the auxiliary breaker is configured to be opened when the fault current flowing through the main breaker reaches a current zero point, thereby removing a remaining current flowing via the switch line and wherein the current limiting reactor is provided to prevent mechanical and thermal hindrance of the circuit due to a current flowing when the circuit is shorted and reduce a required capacity of the breaker by limiting a current to be cut off.