Cummins
Cummins QSB5G12
QSB Series
Cummins QSB5G12 generator-drive diesel engine discovered in the GenProBase public selector. GenProBase lists 2 row(s) across 50Hz, 60Hz with 4.5 L displacement, 4L cylinders, liquid-cooled cooling, and U.S. EPA Final Tier 4 / EU Stage IIIA emissions labeling. Treat this row as source-discovered and prioritize OEM datasheet attachment in a follow-up pass.
Overhaul & repair parts- Manufacturer files
- No datasheet
- Last updated
- 2026-08-05
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 143 kVA
- Electrical Output
- 114 kWe
- Cylinders
- L4
- Displacement
- 4.5 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 121 | 103 | — |
| Standby Power | 134 | 114 | — |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 139 | 114 | — |
| Standby Power | 154 | 126 | — |
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Cummins QSB5G12 overhaul & repair parts
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Cummins QSB5G12 generator set context
The Cummins QSB5G12 is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 143 kVA / 114 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Cummins |
| Model | QSB5G12 |
| Series | QSB Series |
| Configuration | L4, turbocharged aftercooled |
| Cylinders | 4 |
| Displacement | 4.5 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Final Tier 4 / EU Stage IIIA |
| Certifications | U.S. EPA Final Tier 4, EU Stage IIIA |
| Country of Origin | United States / United Kingdom |
Frequently asked questions
What is the power output of the Cummins QSB5G12?
The Cummins QSB5G12 is rated at 143 kVA standby / 129 kVA prime at 50 Hz (1,500 rpm); and 158 kVA standby / 143 kVA prime at 60 Hz (1,800 rpm).
Does the QSB5G12 run at 50 Hz or 60 Hz?
The Cummins QSB5G12 is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Cummins QSB5G12 use?
The Cummins QSB5G12 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the QSB5G12?
The Cummins QSB5G12 is an inline-4 (4-cylinder) engine with a displacement of 4.5 L.
What emissions information is listed for the QSB5G12?
This record lists U.S. EPA Final Tier 4 / EU Stage IIIA for the Cummins QSB5G12. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Cummins QSB5G12?
The Cummins QSB5G12 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.