Jenbacher
Jenbacher J312
Type 3
Jenbacher J312 Type 3 lean-burn natural-gas engine for generator and CHP service. Jenbacher publishes up to 635 kWe at 50 Hz and 635 kWe at 60 Hz at generator terminals, with electrical efficiency up to 43%. Output and emissions depend on gas quality, NOx configuration, voltage and site conditions; the published NOx variants are not an EPA Tier or EU Stage engine certification.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-07-24
- Package route
- gas generator sets
- Prime Power · 50 Hz
- 794 kVA
- Electrical Output
- 635 kWe
- Cylinders
- V12
- Displacement
- 29.2 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 | — | 635 | 793.8 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | — | 635 | 793.8 |
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Jenbacher J312 generator set context
The Jenbacher J312 is listed here as a natural gas generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 794 kVA / 635 kWe / prime 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 | Jenbacher |
| Model | J312 |
| Series | Type 3 |
| Configuration | V12 |
| Cylinders | 12 |
| Displacement | 29.2 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
| Country of Origin | Austria |
Frequently asked questions
What is the power output of the Jenbacher J312?
The Jenbacher J312 is rated at 794 kVA prime at 50 Hz (1,500 rpm); and 794 kVA prime at 60 Hz (1,800 rpm).
Does the J312 run at 50 Hz or 60 Hz?
The Jenbacher J312 is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Jenbacher J312 use?
The Jenbacher J312 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the J312?
The Jenbacher J312 is a V12 (12-cylinder) engine with a displacement of 29.2 L.
What is the catalog status of the Jenbacher J312?
The Jenbacher J312 is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the J312?
This page links reference documents for the Jenbacher J312. Check each document's title, model coverage, revision and rating conditions before using it for selection.