Mitsubishi
Mitsubishi S12H-PTA Switchable
S12H Series
Mitsubishi S12H-PTA Switchable 37.110L V12 constant-speed diesel engine for generator applications. Official MHI output without fan - 50 Hz: prime 930 kWm at 1500 rpm, standby 1020 kWm at 1500 rpm; 60 Hz: prime 990 kWm at 1800 rpm, standby 1120 kWm at 1800 rpm. Emissions: Unregulated.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-23
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 1,211 kVA
- Electrical Output
- 969 kWe
- Cylinders
- V12
- Displacement
- 37.11 L
- Rated Speed
- 1,500 / 1,800 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 | 930 | 883.2 | 1104 |
| Standby Power | 1020 | 968.8 | 1211 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 990 | 940.8 | 1176 |
| Standby Power | 1120 | 1064 | 1330 |
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 S12H-PTA Switchable generator set context
The Mitsubishi S12H-PTA Switchable is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 1,211 kVA / 969 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 | S12H-PTA Switchable |
| Series | S12H Series |
| Configuration | V12 |
| Cylinders | 12 |
| Displacement | 37.11 L |
| Dry Weight | 4450 kg |
| Dimensions (L×W×H) | 2250 × 1472 × 1694 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 S12H-PTA Switchable?
The Mitsubishi S12H-PTA Switchable is rated at 1,211 kVA standby / 1,104 kVA prime at 50 Hz (1,500 rpm); and 1,330 kVA standby / 1,176 kVA prime at 60 Hz (1,800 rpm).
Does the S12H-PTA Switchable run at 50 Hz or 60 Hz?
The Mitsubishi S12H-PTA Switchable is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Mitsubishi S12H-PTA Switchable use?
The Mitsubishi S12H-PTA Switchable is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S12H-PTA Switchable?
The Mitsubishi S12H-PTA Switchable is a V12 (12-cylinder) engine with a displacement of 37.11 L.
What is the catalog status of the Mitsubishi S12H-PTA Switchable?
The Mitsubishi S12H-PTA Switchable 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 S12H-PTA Switchable?
This page links reference documents for the Mitsubishi S12H-PTA Switchable. Check each document's title, model coverage, revision and rating conditions before using it for selection.