Cummins
Cummins C125N6
QSJ8.9G-G2 Genset
Cummins C125N6 is a 125 kWe, 60 Hz natural-gas standby generator set powered by the 8.9 L inline-six QSJ8.9G-G2 engine at 1800 RPM. Cummins publishes this package in its EPA-certified QSJ8.9G range. EPA annual certification data records the matching calibration at 179 kW maximum engine test power.
- Standby Power · 60 Hz
- 156 kVA
- Electrical Output
- 125 kWe
- Cylinders
- L6
- Displacement
- 8.9 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Standby Power | 179 | 125 | 156 |
Cummins C125N6 generator set context
The Cummins C125N6 is listed here as a natural gas generator-drive engine for 60 Hz generator sets, with a headline 156 kVA / 125 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.
Also searched as
Technical Specifications
| Brand | Cummins |
| Model | C125N6 |
| Series | QSJ8.9G-G2 Genset |
| Configuration | Inline-6 Turbocharged |
| Cylinders | 6 |
| Displacement | 8.9 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | U.S. EPA Stationary, U.S. EPA Stationary Emergency, U.S. EPA NSPS |
| Country of Origin | United States |
Frequently asked questions
What is the power output of the Cummins C125N6?
The Cummins C125N6 is rated at 156 kVA standby at 60 Hz (1,800 rpm).
Does the C125N6 run at 50 Hz or 60 Hz?
The Cummins C125N6 is rated for 60 Hz (1,800 rpm).
What fuel does the Cummins C125N6 use?
The Cummins C125N6 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the C125N6?
The Cummins C125N6 is an inline-6 (6-cylinder) engine with a displacement of 8.9 L.
What emissions standard does the C125N6 meet?
The Cummins C125N6 is certified to U.S. EPA Stationary emissions standards.
Is the Cummins C125N6 still in production?
Yes — the Cummins C125N6 is a current production model.
Is a datasheet available for the C125N6?
Yes — an official Cummins datasheet for the Cummins C125N6 can be downloaded from this page.
Related Engines
Compare Cummins C125N6
Reference
- Canonical page
- /engines/cummins-c125n6
- Last database update
- 2026-07-26
- Manufacturer files
- 1 datasheet linked
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