100 kVA to Amps
100 kVA is 144.3 A at 400 V and 5.249 A at 11 kV (three-phase), and 434.8 A at 230 V single-phase. Table for common supplies and the formula.
Formula
Worked example
- Three-phase, 400 V: I = 100 × 1,000 / (√3 × 400) = 144.3 A
- Single-phase, 230 V: I = 100 × 1,000 / 230 = 434.8 A
On other supplies
| Supply | Voltage | Current |
|---|---|---|
| Single-phase | 120 V | 833.3 A |
| Single-phase | 230 V | 434.8 A |
| Single-phase | 240 V | 416.7 A |
| Three-phase | 208 V | 277.6 A |
| Three-phase | 400 V | 144.3 A |
| Three-phase | 415 V | 139.1 A |
| Three-phase | 480 V | 120.3 A |
| Three-phase | 690 V | 83.67 A |
| Three-phase | 6,600 V | 8.748 A |
| Three-phase | 11,000 V | 5.249 A |
| Three-phase | 33,000 V | 1.75 A |
Three-phase rows use the line-to-line voltage.
What 100 kVA looks like
100 kVA is a common distribution transformer rating for a small group of buildings.
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 100 kVA?
100 kVA is 144.3 A on a 400 V three-phase supply, 139.1 A at 415 V and 5.249 A at 11 kV. On a 230 V single-phase supply it is 434.8 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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