Table
3-Phase Transformer Full-Load Amps
3-Phase Transformer Full-Load Amps reference with assumptions and boundary notes.
Reference boundary
Full-load current arithmetic only. It does not set overcurrent protection or conductor protection.
Reference table
Convert common three-phase transformer kVA ratings to full-load current at 600 V.
| Transformer kVA | 600 V 3-phase A | 480 V 3-phase A | Use |
|---|---|---|---|
| 15 | 14.4 | 18 | Approximate line current at rated kVA |
| 30 | 28.9 | 36.1 | Approximate line current at rated kVA |
| 45 | 43.3 | 54.1 | Approximate line current at rated kVA |
| 75 | 72.2 | 90.2 | Approximate line current at rated kVA |
| 112.5 | 108.3 | 135.3 | Approximate line current at rated kVA |
| 150 | 144.3 | 180.4 | Approximate line current at rated kVA |
| 225 | 216.5 | 270.6 | Approximate line current at rated kVA |
| 300 | 288.7 | 360.8 | Approximate line current at rated kVA |
| 500 | 481.1 | 601.4 | Approximate line current at rated kVA |
| 750 | 721.7 | 902.1 | Approximate line current at rated kVA |
| 1000 | 962.3 | 1202.8 | Approximate line current at rated kVA |
Use notes
- Use this table for preliminary reference and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.