Cummins 6BT5.9-G1 vs SDEC 4HTAA4.3-G21
The Cummins 6BT5.9-G1 and SDEC 4HTAA4.3-G21 are both diesel generator engines in a similar power class. Both are rated at roughly 119 kVA. Displacement is 5.9 L versus 4.3 L. The table below compares their full specifications side by side.
| Specification | Cummins 6BT5.9-G1 | SDEC 4HTAA4.3-G21 |
|---|---|---|
| Headline rating | 118 kVA | 119 kVA |
| Standby (50 Hz) | 94 kWe | 95 kWe |
| Prime (50 Hz) | 75 kWe | 86 kWe |
| Standby (60 Hz) | — | 104 kWe |
| Prime (60 Hz) | — | 95 kWe |
| Displacement | 5.9 L | 4.3 L |
| Configuration | L6 | L4 |
| Cylinders | 6 | 4 |
| Rated speed | 1,500 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | China | China |
Choosing between Cummins 6BT5.9-G1 and SDEC 4HTAA4.3-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. The SDEC 4HTAA4.3-G21 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.