SDEC 4ZT4.1-G21 vs Yunnei DEF30CZJB5
The SDEC 4ZT4.1-G21 and Yunnei DEF30CZJB5 are both diesel generator engines in a similar power class. Both are rated at roughly 74 kVA. Displacement is 4.1 L versus 3 L. The table below compares their full specifications side by side.
| Specification | SDEC 4ZT4.1-G21 | Yunnei DEF30CZJB5 |
|---|---|---|
| Headline rating | 74 kVA | 73 kVA |
| Standby (50 Hz) | 59 kWe | — |
| Prime (50 Hz) | 54 kWe | — |
| Standby (60 Hz) | 69 kWe | — |
| Prime (60 Hz) | 63 kWe | 58 kWe |
| Displacement | 4.1 L | 3 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,500 / 1,800 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | China National Stage II / Unregulated | Euro Stage V |
| Dry weight | — | — |
| Origin | China | China |
Choosing between SDEC 4ZT4.1-G21 and Yunnei DEF30CZJB5
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 4ZT4.1-G21 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.