Current (amps) determines wire sizing, breaker ratings, and fuse selection. Converting kVA to amps lets you properly size conductors and protective devices for your electrical system.
3-Phase: I = kVA×1000 ÷ (√3×V). Single-Phase: I = kVA×1000 ÷ V.
Amps determine wire gauge, breaker size, and connector ratings.
Wire sizing, circuit breaker selection, fuse rating, panel scheduling.
kVA (apparent power), Voltage (V), Phase (1Φ or 3Φ), Amps (current).
Different formulas for single-phase and three-phase systems.
For 3-phase. Single-phase: I = kVA × 1000 ÷ V. √3 ≈ 1.732.
3 steps to find current draw.
Get the apparent power rating from the equipment nameplate.
Determine system voltage (e.g. 415V) and phase (1Φ or 3Φ).
For 3Φ: divide kVA×1000 by √3×V. For 1Φ: divide by V alone.
Current at common voltages for 3-phase systems.
| kVA | 208V | 240V | 400V | 415V | 480V |
|---|---|---|---|---|---|
| 5 | 13.9 | 12.0 | 7.2 | 7.0 | 6.0 |
| 10 | 27.8 | 24.1 | 14.4 | 13.9 | 12.0 |
| 25 | 69.4 | 60.1 | 36.1 | 34.8 | 30.1 |
| 50 | 138.8 | 120.3 | 72.2 | 69.6 | 60.1 |
| 100 | 277.6 | 240.6 | 144.3 | 139.1 | 120.3 |
| 500 | 1,388 | 1,203 | 722 | 696 | 601 |
| 1000 | 2,776 | 2,406 | 1,443 | 1,391 | 1,203 |
Real-world current calculations.
50 kVA at 415V 3Φ:
50×1000 ÷ (1.732×415) = 69.6 A
10 kVA at 240V 1Φ:
10×1000 ÷ 240 = 41.7 A
1000 kVA at 480V 3Φ:
1000×1000 ÷ (1.732×480) = 1,203 A
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Questions about kVA to amperes conversion.
100 × 1000 ÷ (1.732 × 415) = 139.1 amps.
Three-phase systems distribute power across 3 conductors, requiring the √3 (1.732) factor.
No. kVA to amps depends only on voltage and phase. PF affects kW, not the current from kVA.
Convert kVA to amps, then select a breaker rated 125% above the calculated current (NEC rule).
Use your actual system voltage: 120V/240V residential, 208V/480V commercial US, 400V/415V international.
Single-phase draws more amps for the same kVA because power flows through fewer conductors.