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The authors'have developed and tested a 400V -lOOA class fault current limiter wound with AC superconducting wire having ultra-fine NbTi filaments. The limiter consists of noninductively wound superconducting mgger coils and a superconducting limiting coil which acts as a reactor. Excessive fault currents initiate quenching in the trigger coils and these currents, which have flown in trigger coils in non-fault condition, are commutated from the mgger coils to the limiting coil. In the experiment, the authors have succeeded in Iimiting a fault current level to 120A with the limiter whose terminal voltage at the limiting condition was 420V.

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