Fault current limiter for limiting fault current generated due to abnormal conditions occurred on a system and lines, the fault current limiter comprising: a first switching unit configured to block an applied fault current and switch a flow path of the fault current; a current limiting impedance unit configured to limit the fault current; a second switching unit configured to switch over a flow path of the fault current connected to the current limiting impedance unit such that the fault current flowing toward the current limiting impedance unit can be limited; and a controller configured to detect the fault current, compare the detected result with a preset reference value, and control the second switching unit according to the comparison result, the fault current limiter characterized by: the first switching unit configured to connect to an input terminal of the fault current limiter, the current limiting impedance unit, the second switching unit and the controller, the first switching unit configured to allow the fault current to flow to the current limiting impedance unit when the fault current is applied, the current limiting impedance unit configured to limit the magnitude and flow duration of the fault current when the fault current flows by bypassing the first switching unit, the second switching unit comprises: a current flowing portion connected in parallel to the current limiting impedance unit; and an auxiliary impedance portion connected in series to the current limiting impedance unit. a first switching unit configured to block an applied fault current and switch a flow path of the fault current; a current limiting impedance unit configured to limit the fault current; a second switching unit configured to switch over a flow path of the fault current connected to the current limiting impedance unit such that the fault current flowing toward the current limiting impedance unit can be limited; and a controller configured to detect the fault current, compare the detected result with a preset reference value, and control the second switching unit according to the comparison result, the fault current limiter characterized by: the first switching unit configured to connect to an input terminal of the fault current limiter, the current limiting impedance unit, the second switching unit and the controller, the first switching unit configured to allow the fault current to flow to the current limiting impedance unit when the fault current is applied, the current limiting impedance unit configured to limit the magnitude and flow duration of the fault current when the fault current flows by bypassing the first switching unit, the second switching unit comprises: a current flowing portion connected in parallel to the current limiting impedance unit; and an auxiliary impedance portion connected in series to the current limiting impedance unit. the first switching unit configured to connect to an input terminal of the fault current limiter, the current limiting impedance unit, the second switching unit and the controller, the first switching unit configured to allow the fault current to flow to the current limiting impedance unit when the fault current is applied, the current limiting impedance unit configured to limit the magnitude and flow duration of the fault current when the fault current flows by bypassing the first switching unit, the second switching unit comprises: a current flowing portion connected in parallel to the current limiting impedance unit; and an auxiliary impedance portion connected in series to the current limiting impedance unit. a current flowing portion connected in parallel to the current limiting impedance unit; and an auxiliary impedance portion connected in series to the current limiting impedance unit.