Cummins 4BT3.9-G2 vs SDEC 4ZTAA3.2-G33
The Cummins 4BT3.9-G2 and SDEC 4ZTAA3.2-G33 are both diesel generator engines in a similar power class. Both are rated at roughly 50 kVA. Displacement is 3.9 L versus 3.2 L. The table below compares their full specifications side by side.
| Specification | Cummins 4BT3.9-G2 | SDEC 4ZTAA3.2-G33 |
|---|---|---|
| Headline rating | 50 kVA | 50 kVA |
| Standby (50 Hz) | 40 kWe | 40 kWe |
| Prime (50 Hz) | 32 kWe | 35 kWe |
| Standby (60 Hz) | 45 kWe | — |
| Prime (60 Hz) | 36 kWe | — |
| Displacement | 3.9 L | 3.2 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | China | China |