Fault Current Calculator

Estimate the maximum available short-circuit current at the secondary terminals of a transformer (Infinite Bus method).

Transformer Ratings

System Phase

Secondary Voltage (L-L)

Transformer Size (kVA)

Impedance (%Z)

Pro Tip: Motor Contribution

For a precise fault study, you must also add the Short Circuit Amps (SCA) contribution from all motors running during the fault (typically 4x total motor FLA added to the infinite bus value).

Secondary Fault

12,028Amps

kVA Rating: 12.0 kAIC minimum panel capability

Transformer FLA601 A

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