Mitsubishi
Mitsubishi S4S-DT61SDB
S4S Series
Mitsubishi S4S-DT61SDB 3.331L L4 constant-speed diesel engine for generator applications. Official MHI output without fan - 50 Hz: prime 36.1 kWm at 1500 rpm, standby 39.8 kWm at 1500 rpm. Emissions: Unregulated.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-07-23
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 45 kVA
- Electrical Output
- 36 kWe
- Cylinders
- L4
- Displacement
- 3.331 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 | 36.1 | 32.5 | 40.6 |
| Standby Power | 39.8 | 35.8 | 44.8 |
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 S4S-DT61SDB generator set context
The Mitsubishi S4S-DT61SDB is listed here as a diesel generator-drive engine for 50 Hz generator sets, with a headline 45 kVA / 36 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-DT61SDB |
| Series | S4S Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 3.331 L |
| Dry Weight | 250 kg |
| Dimensions (L×W×H) | 780 × 593 × 821 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-DT61SDB?
The Mitsubishi S4S-DT61SDB is rated at 45 kVA standby / 41 kVA prime at 50 Hz (1,500 rpm).
Does the S4S-DT61SDB run at 50 Hz or 60 Hz?
The Mitsubishi S4S-DT61SDB is rated for 50 Hz (1,500 rpm).
What fuel does the Mitsubishi S4S-DT61SDB use?
The Mitsubishi S4S-DT61SDB is a diesel generator-set engine.
What is the displacement and cylinder configuration of the S4S-DT61SDB?
The Mitsubishi S4S-DT61SDB is an inline-4 (4-cylinder) engine with a displacement of 3.331 L.
What is the catalog status of the Mitsubishi S4S-DT61SDB?
The Mitsubishi S4S-DT61SDB 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 S4S-DT61SDB?
This page links reference documents for the Mitsubishi S4S-DT61SDB. Check each document's title, model coverage, revision and rating conditions before using it for selection.