Mitsubishi
Mitsubishi S12U-PTA
S12U Series
Mitsubishi S12U-PTA 141.150L V12 constant-speed diesel engine for generator applications. Official MHI output without fan - 50 Hz: prime 2429 kWm at 1000 rpm, standby 2518 kWm at 1000 rpm; 60 Hz: standby 2255 kWm at 900 rpm, prime 2182 kWm at 900 rpm, standby 2703 kWm at 1200 rpm, prime 2576 kWm at 1200 rpm. Emissions: Unregulated.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-23
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 2,990 kVA
- Electrical Output
- 2,392 kWe
- Cylinders
- V12
- Displacement
- 141.15 L
- Rated Speed
- 900 / 1,080 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
50 Hz900 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 2429 | 2308 | 2885 |
| Standby Power | 2518 | 2392 | 2990 |
60 Hz1080 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 2576 | 2447.2 | 3059 |
| Standby Power | 2703 | 2568 | 3210 |
Note: The manufacturer does not publish a separate kWe rating for this engine. kWe values shown are estimated from the rated mechanical output (kWm) using a conservative 90% alternator efficiency factor.
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Mitsubishi S12U-PTA generator set context
The Mitsubishi S12U-PTA is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 2,990 kVA / 2,392 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 | Mitsubishi |
| Model | S12U-PTA |
| Series | S12U Series |
| Configuration | V12 |
| Cylinders | 12 |
| Displacement | 141.15 L |
| Dry Weight | 15500 kg |
| Dimensions (L×W×H) | 3519 × 1820 × 2374 mm |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
| Country of Origin | Japan |
Frequently asked questions
What is the power output of the Mitsubishi S12U-PTA?
The Mitsubishi S12U-PTA is rated at 2,990 kVA standby / 2,885 kVA prime at 50 Hz (900 rpm); and 3,210 kVA standby / 3,059 kVA prime at 60 Hz (1,080 rpm).
Does the S12U-PTA run at 50 Hz or 60 Hz?
The Mitsubishi S12U-PTA is available for both 50 Hz (900 rpm) and 60 Hz (1,080 rpm).
What fuel does the Mitsubishi S12U-PTA use?
The Mitsubishi S12U-PTA is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S12U-PTA?
The Mitsubishi S12U-PTA is a V12 (12-cylinder) engine with a displacement of 141.15 L.
What is the catalog status of the Mitsubishi S12U-PTA?
The Mitsubishi S12U-PTA 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 S12U-PTA?
This page links reference documents for the Mitsubishi S12U-PTA. Check each document's title, model coverage, revision and rating conditions before using it for selection.