Cummins QSK50-G3 vs Mitsubishi S12R-PTA2
The Cummins QSK50-G3 and Mitsubishi S12R-PTA2 are both diesel generator engines in a similar power class. Both are rated at roughly 1,562 kVA. Displacement is 50.3 L versus 49.03 L. The table below compares their full specifications side by side.
| Specification | Cummins QSK50-G3 | Mitsubishi S12R-PTA2 |
|---|---|---|
| Headline rating | 1,561 kVA | 1,562 kVA |
| Standby (50 Hz) | 1,249 kWe | 1,249.6 kWe |
| Prime (50 Hz) | 1,120 kWe | 1,135.2 kWe |
| Standby (60 Hz) | 1,422 kWe | 1,396.8 kWe |
| Prime (60 Hz) | 1,280 kWe | 1,272.8 kWe |
| Displacement | 50.3 L | 49.03 L |
| Configuration | V16 | V12 |
| Cylinders | 16 | 12 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 2 | Unregulated |
| Dry weight | — | 5400 kg |
| Origin | United States | Japan |
Choosing between Cummins QSK50-G3 and Mitsubishi S12R-PTA2
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-PTA2 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.