Mitsubishi
Mitsubishi S4S-61SDB
S4S Series
Mitsubishi S4S-61SDB 3.331L L4 constant-speed diesel engine for generator applications. Official MHI output without fan - 50 Hz: prime 26.9 kWm at 1485 rpm, standby 29.8 kWm at 1485 rpm. Emissions: Unregulated.
- Standby Power · 50 Hz
- 32 kVA
- Electrical Output
- 25 kWe
- Cylinders
- L4
- Displacement
- 3.331 L
- Rated Speed
- 1,485 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf · kWe estimated — see note below
50 Hz1485 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 26.9 | 22.9 | 28.6 |
| Standby Power | 29.8 | 25.4 | 31.7 |
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.
Mitsubishi S4S-61SDB generator set context
The Mitsubishi S4S-61SDB is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 32 kVA / 25 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 | S4S-61SDB |
| Series | S4S Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 3.331 L |
| Dry Weight | 245 kg |
| Dimensions (L×W×H) | 781 × 593 × 710 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 S4S-61SDB?
The Mitsubishi S4S-61SDB is rated at 32 kVA standby / 29 kVA prime at 50 Hz (1,485 rpm).
Does the S4S-61SDB run at 50 Hz or 60 Hz?
The Mitsubishi S4S-61SDB is rated for 50 Hz (1,485 rpm).
What fuel does the Mitsubishi S4S-61SDB use?
The Mitsubishi S4S-61SDB is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S4S-61SDB?
The Mitsubishi S4S-61SDB is an inline-4 (4-cylinder) engine with a displacement of 3.331 L.
Is the Mitsubishi S4S-61SDB still in production?
Yes — the Mitsubishi S4S-61SDB is a current production model.
Is a datasheet available for the S4S-61SDB?
Yes — an official Mitsubishi datasheet for the Mitsubishi S4S-61SDB can be downloaded from this page.
Related Engines
Compare Mitsubishi S4S-61SDB
Reference
- Canonical page
- /engines/mitsubishi-s4s-61sdb
- Last database update
- 2026-07-23
- Manufacturer files
- 1 datasheet linked
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