Cummins
Cummins B3.9CS4GT3
B Series
Cummins B3.9CS4GT3 generator-drive diesel engine discovered in the GenProBase public selector. GenProBase lists 1 row(s) across 50Hz with 3.9 L displacement, 4L cylinders, liquid-cooled cooling, and China IV emissions labeling. Treat this row as source-discovered and prioritize OEM datasheet attachment in a follow-up pass.
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- Manufacturer files
- No datasheet
- Last updated
- 2026-08-05
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 41 kVA
- Electrical Output
- 33 kWe
- Cylinders
- L4
- Displacement
- 3.9 L
- Rated Speed
- 1,500 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 50 | 30 | — |
| Standby Power | 55 | 33 | — |
Cummins B3.9CS4GT3 generator set context
The Cummins B3.9CS4GT3 is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 41 kVA / 33 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 | B3.9CS4GT3 |
| Series | B Series |
| Configuration | L4, turbocharged aftercooled |
| Cylinders | 4 |
| Displacement | 3.9 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | China IV |
| Certifications | China IV |
| Country of Origin | China |
Frequently asked questions
What is the power output of the Cummins B3.9CS4GT3?
The Cummins B3.9CS4GT3 is rated at 41 kVA standby / 38 kVA prime at 50 Hz (1,500 rpm).
Does the B3.9CS4GT3 run at 50 Hz or 60 Hz?
The Cummins B3.9CS4GT3 is rated for 50 Hz (1,500 rpm).
What fuel does the Cummins B3.9CS4GT3 use?
The Cummins B3.9CS4GT3 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the B3.9CS4GT3?
The Cummins B3.9CS4GT3 is an inline-4 (4-cylinder) engine with a displacement of 3.9 L.
What emissions standard does the B3.9CS4GT3 meet?
The Cummins B3.9CS4GT3 is certified to China IV emissions standards.
Is the Cummins B3.9CS4GT3 still in production?
Yes — the Cummins B3.9CS4GT3 is a current production model.