400 kVA to Amps
400 kVA is 577.4 A at 400 V and 20.99 A at 11 kV (three-phase), and 1,739 A at 230 V single-phase. Table for common supplies and the formula.
Formula
Worked example
- Three-phase, 400 V: I = 400 × 1,000 / (√3 × 400) = 577.4 A
- Single-phase, 230 V: I = 400 × 1,000 / 230 = 1,739 A
On other supplies
| Supply | Voltage | Current |
|---|---|---|
| Single-phase | 120 V | 3,333 A |
| Single-phase | 230 V | 1,739 A |
| Single-phase | 240 V | 1,667 A |
| Three-phase | 208 V | 1,110 A |
| Three-phase | 400 V | 577.4 A |
| Three-phase | 415 V | 556.5 A |
| Three-phase | 480 V | 481.1 A |
| Three-phase | 690 V | 334.7 A |
| Three-phase | 6,600 V | 34.99 A |
| Three-phase | 11,000 V | 20.99 A |
| Three-phase | 33,000 V | 6.998 A |
Three-phase rows use the line-to-line voltage.
What 400 kVA looks like
400 kVA is a common size for the supply to a medium commercial building.
This is the rated current only. Cable, breaker and protection settings also depend on the installation, inrush, the rules you work to and the transformer data sheet.
Frequently asked questions
How many amps is 400 kVA?
400 kVA is 577.4 A on a 400 V three-phase supply, 556.5 A at 415 V and 20.99 A at 11 kV. On a 230 V single-phase supply it is 1,739 A. The current depends on the voltage, so there is no single answer.
Why is no power factor needed?
kVA is apparent power, which is voltage times current (times √3 for three-phase). The power factor only matters when you convert kVA to kW.
Is this the rated current of a transformer?
It is the rated line current at that voltage for a balanced load: kVA × 1,000 / (√3 × V). Inrush, overload and fault current are separate questions.
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