A fast switch installed in a current limiter, connected to a current limiting resistor in parallel, and configured to detour a fault current to a circuit to which the current limiting resistor is connected when the fault current occurs, the fast switch comprising: a housing; a vacuum interrupter installed in the housing, connected to a main circuit, and configured to open and close the main circuit; a contact spring coupled to a mover of the vacuum interrupter, and configured to provide a contact force; an insulating rod connected to the contact spring; a permanent magnet actuator connected to a lower end of the insulating rod, and configured to provide a switching driving force; and a driving coil connected to a lower end of the permanent magnet actuator; and a first capacitor configured to provide a discharge current to coils (41, 42) of the permanent magnet actuator; a second capacitor configured to provide a discharge current to the driving coil; and a repulsive plate provided below the driving coil, and vertically moving by an electronic repulsive force generated by a magnetic force of the driving coil; wherein the coils (41, 42) include: an open coil configured to make the vacuum interrupter perform an opening operation; and a close coil configured to make the vacuum interrupter perform a closing operation. wherein a discharge current flows to the open coil from the first capacitor, for prevention of a re-closing operation of the main circuit due to the electronic repulsive force of the repulsive plate when the vacuum interrupter performs an opening operation. a housing; a vacuum interrupter installed in the housing, connected to a main circuit, and configured to open and close the main circuit; a contact spring coupled to a mover of the vacuum interrupter, and configured to provide a contact force; an insulating rod connected to the contact spring; a permanent magnet actuator connected to a lower end of the insulating rod, and configured to provide a switching driving force; and a driving coil connected to a lower end of the permanent magnet actuator; and a first capacitor configured to provide a discharge current to coils (41, 42) of the permanent magnet actuator; a second capacitor configured to provide a discharge current to the driving coil; and a repulsive plate provided below the driving coil, and vertically moving by an electronic repulsive force generated by a magnetic force of the driving coil; wherein the coils (41, 42) include: an open coil configured to make the vacuum interrupter perform an opening operation; and a close coil configured to make the vacuum interrupter perform a closing operation. wherein a discharge current flows to the open coil from the first capacitor, for prevention of a re-closing operation of the main circuit due to the electronic repulsive force of the repulsive plate when the vacuum interrupter performs an opening operation. an open coil configured to make the vacuum interrupter perform an opening operation; and a close coil configured to make the vacuum interrupter perform a closing operation. wherein a discharge current flows to the open coil from the first capacitor, for prevention of a re-closing operation of the main circuit due to the electronic repulsive force of the repulsive plate when the vacuum interrupter performs an opening operation.