kVA to Amps Calculator
Convert apparent power in kVA to electrical current in Amps. Switch between kVA to Amps and Amps to kVA conversions instantly.
kVA to Amps Converter
How to Use the kVA to Amps Converter
Converting apparent power in kVA into electrical current in Amps is simple. Follow these steps:
- 1Select Phase Type: Choose between Single Phase or Three Phase configuration.
- 2Enter Apparent Power (kVA): Input your system apparent power rating.
- 3Enter Voltage: Input the operational AC line voltage in volts.
- 4Click Calculate: Press 'Calculate to Amps' to run the formulas.
How to Calculate kVA to Amps (Step-by-Step Guide)
Converting apparent power in kVA to electrical current in Amps helps size transformers, backup generator panels, and main feeder distribution cables. The formulas and mathematical workflow are presented below.
kVA to Amps Formulas
For Single-Phase AC:
For Balanced Three-Phase AC:
Where:
- I: Current in Amperes (A)
- kVA: Apparent power rating
- V: Operating line voltage in volts (V)
Real-Life Scenario: Sizing Current for a Backup Generator (10 kVA)
A rural cabin uses a 10 kVA backup generator configured for 230V single-phase. Sizing the transfer switch requires calculating the nominal current output:
- 1Apply Single-Phase Equation:
I = (10 × 1,000) ÷ 230 - 2Divide Numerator by Denominator:
I = 10,000 ÷ 230 ≈ 43.48 Amps
Final Output: The current rating is approximately 43.48 A.
kVA to Amps Reference Conversion Chart
The table below displays current ratings (Amps) across standard kVA values for Single-Phase (230V) and Three-Phase (400V) systems:
| Apparent Power (kVA) | Single-Phase (230V) | Three-Phase (400V) |
|---|---|---|
| 5 kVA | 21.74 A | 7.22 A |
| 10 kVA | 43.48 A | 14.43 A |
| 15 kVA | 65.22 A | 21.65 A |
| 25 kVA | 108.70 A | 36.08 A |
| 100 kVA | 434.78 A | 144.34 A |
| 500 kVA | 2,173.91 A | 721.69 A |
kVA to Amps Formula Three Phase
The standard kva to amps formula three phase incorporates the root three line constant:
I = (kVA × 1,000) ÷ (1.732 × VLL).
This applies to balanced line loads.
5 kVA to Amps
A rating of 5 kva to amps operated at 230V single-phase draws:
I = (5 × 1,000) ÷ 230 ≈ 21.74 Amps.
This sizing is common for small residential solar inverters.
15 kVA to Amps 3-Phase
An auxiliary transformer delivering 15 kva to amps 3-phase on a 400V line draws:
I = (15 × 1,000) ÷ (1.732 × 400) ≈ 21.65 Amps.
500 kVA to Amps 3-Phase
A commercial substation drawing 500 kva to amps 3-phase at 480V draws:
I = (500 × 1,000) ÷ (1.732 × 480) ≈ 601.42 Amps.
100 kVA to Amps 3-Phase
An industrial distribution panel handling 100 kva to amps 3-phase at 400V draws:
I = (100 × 1,000) ÷ (1.732 × 400) ≈ 144.34 Amps.
10 kVA to Amps
A residential generator capacity of 10 kva to amps operating at 240V single-phase draws:
I = (10 × 1,000) ÷ 240 ≈ 41.67 Amps.
25 kVA to Amps 3-Phase
Converting a load of 25 kva to amps 3-phase on a standard 400V line yields:
I = (25 × 1,000) ÷ (1.732 × 400) ≈ 36.08 Amps.
Frequently Asked Questions (FAQs)
To convert kVA to Amps, multiply the kVA value by 1,000, then divide by the system voltage. For three-phase systems, divide by the product of 1.732 and the line voltage.
At 400V three-phase, 200 kVA translates to: I = 200,000 ÷ (1.732 × 400) ≈ 288.68 Amps.
The three-phase current calculation is: Amps = (kVA × 1,000) ÷ (1.732 × Voltage).
1 kVA represents 1,000 Volt-Amperes of apparent power. At 230V single-phase, it draws 4.35 Amps.
5 kVA represents 5,000 Volt-Amperes. At 400V three-phase, it draws approximately 7.22 Amps.
At 230V single-phase, 10 kVA equals approximately 43.48 Amps.
A 100 Amp three-phase supply operating at 400V supports: kVA = (1.732 × 100 × 400) ÷ 1,000 = 69.28 kVA.
At 400V three-phase, 69 kVA draws: I = 69,000 ÷ (1.732 × 400) ≈ 99.59 Amps.
At 400V three-phase, a 1,000 kVA transformer output rating draws: I = 1,000,000 ÷ (1.732 × 400) ≈ 1,443.38 Amps.