Mitsubishi
Mitsubishi S12R-A2PTAW
S12R Series
Mitsubishi S12R-A2PTAW 49.030L V12 constant-speed diesel engine for generator applications. Official MHI output without fan - 50 Hz: prime 1114 kWm at 1500 rpm, standby 1225 kWm at 1500 rpm. Emissions: Unregulated (prime); U.S. EPA Tier 2 (standby).
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-23
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 1,455 kVA
- Electrical Output
- 1,164 kWe
- Cylinders
- V12
- Displacement
- 49.03 L
- Rated Speed
- 1,500 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 1114 | 1058.4 | 1323 |
| Standby Power | 1225 | 1164 | 1455 |
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 S12R-A2PTAW generator set context
The Mitsubishi S12R-A2PTAW is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 1,455 kVA / 1,164 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 | S12R-A2PTAW |
| Series | S12R Series |
| Configuration | V12 |
| Cylinders | 12 |
| Displacement | 49.03 L |
| Dry Weight | 5270 kg |
| Dimensions (L×W×H) | 2491 × 1457 × 1647 mm |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Tier 2 |
| Country of Origin | Japan |
Frequently asked questions
What is the power output of the Mitsubishi S12R-A2PTAW?
The Mitsubishi S12R-A2PTAW is rated at 1,455 kVA standby / 1,323 kVA prime at 50 Hz (1,500 rpm).
Does the S12R-A2PTAW run at 50 Hz or 60 Hz?
The Mitsubishi S12R-A2PTAW is rated for 50 Hz (1,500 rpm).
What fuel does the Mitsubishi S12R-A2PTAW use?
The Mitsubishi S12R-A2PTAW is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S12R-A2PTAW?
The Mitsubishi S12R-A2PTAW is a V12 (12-cylinder) engine with a displacement of 49.03 L.
What emissions information is listed for the S12R-A2PTAW?
This record lists U.S. EPA Tier 2 for the Mitsubishi S12R-A2PTAW. 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 Mitsubishi S12R-A2PTAW?
The Mitsubishi S12R-A2PTAW 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 S12R-A2PTAW?
This page links reference documents for the Mitsubishi S12R-A2PTAW. Check each document's title, model coverage, revision and rating conditions before using it for selection.