A plug for a DC appliance comprising: an input unit including anode and cathode terminals inserted into a socket so as to receive a DC current; an output unit including anode and cathode terminals so as to allow the DC current input through the input unit to be output to an electric device; a connection unit including anode (Line 1) and cathode (Line 2) lines so as to interconnect the input unit and the output unit; an inductor unit coupled between the input unit and the output unit in such a manner that an internal current of the plug is gradually increased in response to an increase of the input DC current, wherein one terminal of the inductor unit is coupled to an anode terminal of the input unit and another terminal of the inductor unit is coupled to the anode terminal of the output unit; a rectifier unit, wherein the cathode terminal of the rectifier unit is coupled to the anode terminal of the output unit and the anode terminal thereof is coupled to the cathode of the output terminal so as to rectify the input DC current; and a condenser unit connected in parallel to the rectifier unit, wherein the condenser unit is coupled between anode and cathode terminals of the output unit, the condenser unit configured to be charged with voltage in response to a current passing through the inductor unit, and to discharge the charged voltage to the output unit when the input of the DC current from the input unit is interrupted; wherein the rectifier unit is adapted to flow back a current present in the plug to the output unit when the DC current input is stopped by the input unit disconnected from the socket, thereby preventing an arc phenomenon generated when the current is leaked to outside of the plug; wherein the inductor unit is adapted to prevent an internal current of the plug from being rapidly increased when the input unit is inserted into the socket and the DC current input is increased, thereby preventing flow of an in-rush current; wherein the condenser unit is adapted to reduce a voltage difference between the input unit and the output unit when the DC current input is stopped by the input unit disconnected from the socket, thereby preventing an arc phenomenon. an input unit including anode and cathode terminals inserted into a socket so as to receive a DC current; an output unit including anode and cathode terminals so as to allow the DC current input through the input unit to be output to an electric device; a connection unit including anode (Line 1) and cathode (Line 2) lines so as to interconnect the input unit and the output unit; an inductor unit coupled between the input unit and the output unit in such a manner that an internal current of the plug is gradually increased in response to an increase of the input DC current, wherein one terminal of the inductor unit is coupled to an anode terminal of the input unit and another terminal of the inductor unit is coupled to the anode terminal of the output unit; a rectifier unit, wherein the cathode terminal of the rectifier unit is coupled to the anode terminal of the output unit and the anode terminal thereof is coupled to the cathode of the output terminal so as to rectify the input DC current; and a condenser unit connected in parallel to the rectifier unit, wherein the condenser unit is coupled between anode and cathode terminals of the output unit, the condenser unit configured to be charged with voltage in response to a current passing through the inductor unit, and to discharge the charged voltage to the output unit when the input of the DC current from the input unit is interrupted; wherein the rectifier unit is adapted to flow back a current present in the plug to the output unit when the DC current input is stopped by the input unit disconnected from the socket, thereby preventing an arc phenomenon generated when the current is leaked to outside of the plug; wherein the inductor unit is adapted to prevent an internal current of the plug from being rapidly increased when the input unit is inserted into the socket and the DC current input is increased, thereby preventing flow of an in-rush current; wherein the condenser unit is adapted to reduce a voltage difference between the input unit and the output unit when the DC current input is stopped by the input unit disconnected from the socket, thereby preventing an arc phenomenon.