Kiloamperes (kA) express large currents — used for fault level calculations, busbar ratings, and circuit breaker interrupting capacity. Converting kVA to kA is essential for electrical protection design.
3Φ: kA = kVA ÷ (kV × √3). 1Φ: kA = kVA ÷ kV.
kA ratings determine if switchgear can safely interrupt fault currents.
Switchgear selection, busbar sizing, fault level studies, protection coordination.
Under-rated kA equipment can explode during faults. Always verify ratings.
Derive kiloamperes from apparent power and voltage.
For 3-phase. Single-phase: kA = kVA ÷ kV. Voltage must be in kilovolts.
3 steps for kiloampere calculation.
Find transformer or system kVA rating.
Use system voltage in kilovolts (e.g. 0.415 kV = 415V).
For 3Φ: kVA ÷ (kV × 1.732). Result is in kA.
Current in kA at common voltages.
| kVA | 0.415 kV | 3.3 kV | 6.6 kV | 11 kV | 33 kV |
|---|---|---|---|---|---|
| 100 | 0.139 | 0.017 | 0.009 | 0.005 | 0.002 |
| 500 | 0.696 | 0.087 | 0.044 | 0.026 | 0.009 |
| 1000 | 1.391 | 0.175 | 0.087 | 0.052 | 0.017 |
| 5000 | 6.956 | 0.875 | 0.437 | 0.262 | 0.087 |
| 10000 | 13.91 | 1.749 | 0.875 | 0.525 | 0.175 |
| 50000 | 69.56 | 8.748 | 4.374 | 2.624 | 0.875 |
Fault current and rating scenarios.
1000 kVA at 0.415 kV (3Φ):
1000 ÷ (0.415 × 1.732) = 1.39 kA
10,000 kVA at 11 kV (3Φ):
10000 ÷ (11 × 1.732) = 0.525 kA
500 kVA at 0.415 kV (3Φ):
500 ÷ (0.415 × 1.732) = 0.696 kA (696 A)
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Questions about kVA to kiloampere conversion.
Kiloamperes — 1 kA = 1,000 amps. Used for fault currents and switchgear ratings.
Circuit breakers and switchgear must be rated to safely interrupt fault currents measured in kA.
LV (415V): 10–50 kA. MV (11kV): 12.5–25 kA. HV (33kV): 16–31.5 kA.
Same formula but kA = amps ÷ 1000. Enter voltage in kV (not V) to get kA directly.
Calculate fault kA at the point, then select a breaker with equal or higher kA interrupting capacity.
No. kVA to kA depends only on voltage and phase, not power factor.