Genuine Sunon 40×40×20mm 12V DC cooling fan with electromagnetic MagLev bearing. Rated at 15.5dBA — near-silent in operation. 8.9 CFM airflow at 3,000 RPM and rated for 100,000 hours of continuous use. A direct OEM replacement used in routers, NAS enclosures, 3D printers, and embedded systems worldwide.
Specifications
| Model | KDE1204PKV3 MS.AF.GN |
| Size | 40 × 40 × 20mm (4020) |
| Connector | 3-Pin (GND / 12V / Tach) |
| Bearing Type | Electromagnetic (MagLev) |
| Rated Voltage | 12V DC |
| Working Voltage Range | 4V – 13V |
| Power | 0.4W |
| Speed | 3,000 RPM |
| Airflow | 8.9 CFM |
| Noise Level | 15.5 dBA |
| Rated Lifespan | 100,000 hours |
| Brand | Genuine Sunon |
Wiring — 3-Pin Connector
| Black wire | GND (negative / ground) |
| Red wire | +12V (positive supply) |
| Yellow wire | Tach signal (speed feedback — optional, can be left unconnected) |
This is a 3-pin fan — it does not support PWM speed control. Speed is fixed at 3,000 RPM when powered at 12V. The tach wire provides a pulse signal for fan speed monitoring only; it does not need to be connected for the fan to operate. Running at lower voltages (down to ~4V) will reduce speed and noise at the cost of airflow.
What's Included
| 1 × | Sunon KDE1204PKV3 40×40×20mm fan with pre-attached 3-pin connector |
Common Uses
Router & NAS fan replacement — Ubiquiti, MikroTik, Synology & others
3D printer hotend & electronics bay cooling
Mini-PC, SBC & embedded system enclosure cooling
Network switches & rack equipment ventilation
Industrial & medical equipment using 40mm 12V fans
Any device requiring a 40×40×20mm 12V 3-pin replacement
Common Questions
Can I control the speed with PWM?
No — this is a 3-pin fan (GND, 12V, Tach) with no PWM wire. Speed is fixed at 3,000 RPM at 12V. To reduce speed, lower the supply voltage, but note airflow and cooling performance will decrease proportionally.
Will this fit my device — how do I check?
Measure your existing fan: the body should be 40mm × 40mm × 20mm deep, with mounting holes on a 32mm square pattern. Confirm your device uses a 3-pin 12V header. The connector style is standard JST-style 3-pin.
Is this a genuine Sunon fan or a clone?
Genuine Sunon — the model number KDE1204PKV3 MS.AF.GN is a real Sunon part. Sunon is a Taiwanese manufacturer used by OEMs worldwide. The MagLev bearing provides significantly longer lifespan than ball or sleeve bearings.
Please note: 3-pin connector (GND / 12V / Tach) — no PWM speed control. Verify your device uses a 3-pin header before ordering. Genuine Sunon — not a generic clone.