Mitsubishi S12R-PTAA2 vs Perkins 401246TWG4A
The Mitsubishi S12R-PTAA2 and Perkins 401246TWG4A are both diesel generator engines in a similar power class. Both are rated at roughly 1,616 kVA. Displacement is 49.03 L versus 46 L. The table below compares their full specifications side by side.
| Specification | Mitsubishi S12R-PTAA2 | Perkins 401246TWG4A |
|---|---|---|
| Headline rating | 1,621 kVA | 1,610 kVA |
| Standby (50 Hz) | 1,296.9 kWe | 1,288 kWe |
| Prime (50 Hz) | 1,182.6 kWe | 1,204 kWe |
| Standby (60 Hz) | 1,469.7 kWe | 1,288 kWe |
| Prime (60 Hz) | 1,335.6 kWe | 1,204 kWe |
| Displacement | 49.03 L | 46 L |
| Configuration | V12 | V12 |
| Cylinders | 12 | 12 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | Japan | India / United Kingdom |
Choosing between Mitsubishi S12R-PTAA2 and Perkins 401246TWG4A
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The Mitsubishi S12R-PTAA2 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.