We supply liquid filled pad mounted distribution transformers. If the unit is going outdoors on a concrete pad, the smallest three phase pad mounted rating is 45 kVA. See three phase ratings and single phase ratings.
Full load current
| Configuration | Full load current |
|---|---|
| 480 V three phase | 36 A |
| 208 V three phase | 83 A |
| 240 V single phase | 125 A |
| 120 V single phase | 250 A |
Nameplate full load current, computed from the standard formula. Free to cite with a link to this page. Any other rating, use the kVA to amps calculator.
What this rating is
A 30 kVA transformer is a common dry type size for small commercial fit outs, feeding a 208Y/120 panel from a 480 volt service. It is an indoor unit, normally floor or wall mounted in a mechanical space.
30 kVA at 480 to 208 is one of the most ordered dry type combinations in commercial construction. At 480 volts three phase it draws about 36 amps, and delivers about 83 amps at 208 volts.
Common questions
How many amps is a 30 kVA transformer
About 36 amps at 480 V three phase. About 83 amps at 208 V three phase. About 125 amps at 240 V single phase. About 250 amps at 120 V single phase. Three phase current is kVA times 1000 divided by the voltage times the square root of three. Single phase leaves out the square root of three, which is why the single phase figures are much higher.
What is a 30 kVA transformer used for
A 30 kVA transformer is a common dry type size for small commercial fit outs, feeding a 208Y/120 panel from a 480 volt service. It is an indoor unit, normally floor or wall mounted in a mechanical space.
Is a 30 kVA transformer pad mounted
No, it is a dry type unit rather than a liquid filled pad mounted transformer. If the unit is going outdoors on a concrete pad, the smallest three phase pad mounted rating is 45 kVA.