Caterpillar G3408 vs Cummins GTA855E
The Caterpillar G3408 and Cummins GTA855E are both natural gas generator engines in a similar power class. Both are rated at roughly 310 kVA. Displacement is 18 L versus 14 L. The table below compares their full specifications side by side.
| Specification | Caterpillar G3408 | Cummins GTA855E |
|---|---|---|
| Headline rating | 313 kVA | 306 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 250 kWe | — |
| Standby (60 Hz) | — | 245 kWe |
| Prime (60 Hz) | — | 225 kWe |
| Displacement | 18 L | 14 L |
| Configuration | V8 | L6 |
| Cylinders | 8 | 6 |
| Rated speed | 1,500 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | U.S. EPA Stationary |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Caterpillar G3408 and Cummins GTA855E
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 Caterpillar G3408 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.