SDEC
SDEC 4ZT3.5-G21
Z Series
The SDEC 4ZT3.5-G21 is a 3.5-litre inline-4 diesel engine for generator sets, rated at 61 kVA / 49 kWe standby power at 1,500 RPM (50 Hz). It is a liquid-cooled engine built in China.
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- Manufacturer files
- 2 datasheets
- Last updated
- 2026-07-24
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 61 kVA
- Electrical Output
- 49 kWe
- Cylinders
- L4
- Displacement
- 3.5 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 49 | 44 | 55 |
| Standby Power | 54 | 49 | 61.3 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 60 | 54 | 67.5 |
| Standby Power | 66 | 59 | 73.8 |
SDEC 4ZT3.5-G21 generator set context
The SDEC 4ZT3.5-G21 is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 61 kVA / 49 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 | SDEC |
| Model | 4ZT3.5-G21 |
| Series | Z Series |
| Configuration | L4 |
| Cylinders | 4 |
| Displacement | 3.5 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | China National Stage II / Unregulated |
| Country of Origin | China |
Frequently asked questions
What is the power output of the SDEC 4ZT3.5-G21?
The SDEC 4ZT3.5-G21 is rated at 61 kVA standby / 55 kVA prime at 50 Hz (1,500 rpm); and 74 kVA standby / 68 kVA prime at 60 Hz (1,800 rpm).
Does the 4ZT3.5-G21 run at 50 Hz or 60 Hz?
The SDEC 4ZT3.5-G21 is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the SDEC 4ZT3.5-G21 use?
The SDEC 4ZT3.5-G21 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 4ZT3.5-G21?
The SDEC 4ZT3.5-G21 is an inline-4 (4-cylinder) engine with a displacement of 3.5 L.
Is the SDEC 4ZT3.5-G21 still in production?
Yes — the SDEC 4ZT3.5-G21 is a current production model.
Is a datasheet available for the 4ZT3.5-G21?
Yes — an official SDEC datasheet for the SDEC 4ZT3.5-G21 can be downloaded from this page.