Caterpillar 3408 vs SDEC 6ETAA12.8-G21
The Caterpillar 3408 and SDEC 6ETAA12.8-G21 are both diesel generator engines in a similar power class. Both are rated at roughly 456 kVA. Displacement is 18 L versus 12.8 L. The table below compares their full specifications side by side.
| Specification | Caterpillar 3408 | SDEC 6ETAA12.8-G21 |
|---|---|---|
| Headline rating | 456 kVA | 456 kVA |
| Standby (50 Hz) | 365 kWe | 365 kWe |
| Prime (50 Hz) | 330 kWe | 331 kWe |
| Standby (60 Hz) | 440 kWe | 365 kWe |
| Prime (60 Hz) | 400 kWe | 331 kWe |
| Displacement | 18 L | 12.8 L |
| Configuration | V8 | L6 |
| Cylinders | 8 | 6 |
| 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 | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | United States | China |
Choosing between Caterpillar 3408 and SDEC 6ETAA12.8-G21
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.