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. <EOS>