A power conversion device including: a DC link capacitor configured to be charged by direct current (DC) power supplied from a power supply ; a fuse unit connected to an output of the power supply , wherein the fuse unit is configured to block a current output from the power supply or to be supplied to the power supply and having a magnitude greater than or equal to a first blocking magnitude; a relay unit including a first relay configured to connect a positive terminal of the fuse unit and a positive terminal of the DC link capacitor , and a second relay configured to connect a negative terminal of the fuse unit and a negative terminal of the DC link capacitor ; an initial charging unit connected in parallel with the first relay , wherein the initial charging unit is configured to charge the DC link capacitor with the DC power supplied from the power supply ; and a power converter configured to convert the DC power from the power supply into AC power when the DC link capacitor has been charged, and to supply the converted AC power to a load terminal , wherein the relay unit is configured to block a current flowing in the first relay or the second relay and having a magnitude equal to or greater than a second blocking magnitude, characterised in that the first relay is configured to block only a current supplied from the power supply and having a magnitude equal to or greater than the second blocking magnitude, and wherein the second relay is configured to block only a current to be supplied to the power supply and having a magnitude equal to or greater than the second blocking magnitude. a DC link capacitor configured to be charged by direct current (DC) power supplied from a power supply ; a fuse unit connected to an output of the power supply , wherein the fuse unit is configured to block a current output from the power supply or to be supplied to the power supply and having a magnitude greater than or equal to a first blocking magnitude; a relay unit including a first relay configured to connect a positive terminal of the fuse unit and a positive terminal of the DC link capacitor , and a second relay configured to connect a negative terminal of the fuse unit and a negative terminal of the DC link capacitor ; an initial charging unit connected in parallel with the first relay , wherein the initial charging unit is configured to charge the DC link capacitor with the DC power supplied from the power supply ; and a power converter configured to convert the DC power from the power supply into AC power when the DC link capacitor has been charged, and to supply the converted AC power to a load terminal , wherein the relay unit is configured to block a current flowing in the first relay or the second relay and having a magnitude equal to or greater than a second blocking magnitude, characterised in that the first relay is configured to block only a current supplied from the power supply and having a magnitude equal to or greater than the second blocking magnitude, and wherein the second relay is configured to block only a current to be supplied to the power supply and having a magnitude equal to or greater than the second blocking magnitude. <EOS>