Short Circuit Current Calculator

Calculate secondary fault currents at transformer terminals to check panel short-circuit withstand ratings (SCCR) and breaker KA capacities.

Purpose of this Tool: Size prospective fault levels to determine protective devices' maximum breaking capacity requirements.

• Secondary Nominal FLA Current:I_{FLA} = \frac{S_{kVA} \times 1000}{\sqrt{3} \times V_{LL}}

• Terminal Fault Current (Isc):I_{SC(kA)} = \frac{I_{FLA}}{\%Z / 100} \times \frac{1}{1000} = \frac{I_{FLA} \times 100}{\%Z \times 1000}

Transformer Sizing (kVA)

kVA

1010000

Line-to-Line Voltage (V)

11011000

Transformer Impedance (%Z)

115

Fault Parameters

Secondary Full Load Current1391.2

Amps

Prospective Fault Current (Isc)27.824

kA Fault

Short Circuit MVA Rating20.00

MVA Capacity

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