Cummins QSB5G4 vs JCB 448 TA3-100
The Cummins QSB5G4 and JCB 448 TA3-100 are both diesel generator engines in a similar power class. Both are rated at roughly 100 kVA. Displacement is 4.5 L versus 4.8 L. The table below compares their full specifications side by side.
| Specification | Cummins QSB5G4 | JCB 448 TA3-100 |
|---|---|---|
| Headline rating | 100 kVA | 99 kVA |
| Standby (50 Hz) | 80 kWe | 79.2 kWe |
| Prime (50 Hz) | 73 kWe | 73.8 kWe |
| Standby (60 Hz) | 90 kWe | 90 kWe |
| Prime (60 Hz) | 82 kWe | 85.5 kWe |
| Displacement | 4.5 L | 4.8 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| 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 3 / EU Stage IIIA / China III | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | United States / United Kingdom | United Kingdom |
Choosing between Cummins QSB5G4 and JCB 448 TA3-100
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 Cummins QSB5G4 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.