The 255M from EBM-Papst is a compact axial fan with a wall ring for direct current, designed for space-constrained applications where efficient cooling is crucial. With dimensions of 25 x 25 x 8 mm and a nominal voltage of 5 V DC, it fits perfectly into dense electronic devices and embedded systems. The brushless DC motor ensures a long service life and reliable performance.
The fan is well-suited for cooling electronic boards, network equipment, and other compact devices where low noise and a small form factor are required.
- Voltage: 5 V DC (range 4.5–5.5 V)
- Airflow: 2.3 m³/h at free flow
- Speed: 6,500 rpm
- Sound pressure level: 5 dB(A)
- Power: 0.25 W, rated current 50 mA
- Dimensions: 25 x 25 x 8 mm, plastic housing
- Sleeve bearing, optional mounting position
- Connection cable 160 mm with polarity protection via impedance
At Reserv, you'll find original EBM-Papst parts stocked by established wholesalers. This means fast delivery and reliable quality—whether you need a single fan or several. See the datasheet on the product page for complete technical information.
Technical specifications
Datasheet (PDF) - download| Product attribute | Value |
|---|---|
| Airflow at 0 Pa | 2.3 m³/h |
| Speed | 6,500 rpm |
| Power | 0.25 W |
| Voltage | 5 V DC VAC |
| Motor frame | The housing is square and made of plastic, with dimensions of 25 x 25 x 8 mm and a mass of 0.005 kg. Mounting is done using degreased ISO 4762 M2.5 screws, without additional support or washer. The mounting position of the shaft is arbitrary, and the maximum torque for mounting across both flanges is 20 Ncm for the remaining corners. |
| Casing | plastic, square |
| Impeller | The fan impeller is made of plastic and rotates counter-clockwise when viewed from the rotor side. The airflow direction is outward over the struts. With free airflow and a nominal speed of 6500 rpm, the fan impeller delivers a maximum airflow of 2.3 m³/h and a maximum static pressure of 15 Pa. |
| Bearing type | plain bearing |
| Rotation direction | anticlockwise |
| Motor type | The motor is a brush-less DC motor designed for 5 V nominal voltage with a voltage range of 4.5–5.5 V. Motor protection is provided by impedance protection for locked rotor, with a locked rotor current consumption of approximately 60 mA. The motor lacks additional electronic functions but has reverse polarity protection via impedance. Protection class III applies to electrical safety. |
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