Short-Circuit Current Calculator

Estimate prospective short-circuit current from system voltage and total fault-loop impedance.

480 V with Zsource 0.050 ohm =

6.86 kA

Representative value from the Short-Circuit Current Calculator reference table.

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Short-Circuit Current Calculator

Simplified fault current estimation for planning and checks.

Estimated Fault Current

Reference Table

Use this complete table for quick lookup and internal linking to specific value pages.

Short-Circuit Current Calculator Reference
Source ConditionProspective Fault CurrentFault Current (A)
480 V with Zsource 0.005 ohm19.2 kA19,200
480 V with Zsource 0.010 ohm16 kA16,000
480 V with Zsource 0.015 ohm13.71 kA13,714.3
480 V with Zsource 0.020 ohm12 kA12,000
480 V with Zsource 0.030 ohm9.6 kA9,600
480 V with Zsource 0.040 ohm8 kA8,000
480 V with Zsource 0.050 ohm6.86 kA6,857.1
480 V with Zsource 0.075 ohm5.05 kA5,052.6
480 V with Zsource 0.100 ohm4 kA4,000
480 V with Zsource 0.150 ohm2.82 kA2,823.5
480 V with Zsource 0.200 ohm2.18 kA2,181.8
480 V with Zsource 0.250 ohm1.78 kA1,777.8