3312 NN ebm-papst: The 92mm Cooling Standard
The 3312 NN is a versatile compact axial fan from the ebm-papst 3300 N series. Measuring **92 mm x 92 mm x 32 mm**, this unit strikes a perfect balance between airflow performance and compact dimensions, making it a staple in power supply units, medical devices, and compact electronic enclosures. Operating on a nominal **12 VDC**, the 3312 NN is designed for general-purpose cooling where reliability is paramount. The housing and impeller are constructed from fiberglass-reinforced plastic (PBT), providing a lightweight yet rigid structure that resists deformation even under thermal stress.
Technical Specifications
- Dimensions: 92 x 92 x 32 mm.
- Nominal Voltage: 12 VDC (Range 8 – 15 VDC).
- Airflow: Approx. 80 m³/h.
- Power Input: 1.8 – 2.5 W.
- Noise Level: 35 – 37 dB(A).
- Bearing System: Sintec Sleeve or Ball Bearings (Check specific revision).
Lifecycle & Maintenance Diagnosis
Lifecycle State: Active. Diagnosis: A common issue in 12V fans is bearing dry-out. If the fan makes a rattling noise on startup that disappears after a minute, the lubricant is degrading. Replace immediately to prevent seizing. Installation Advice: The «NN» designation typically implies a standard variant (often without a tachometer signal, just 2 wires: Red/Blue). Verify your connector pinout before installing. Compatibility: Universally compatible with 12V headers on industrial motherboards or directly wired to 12V DIN rail power supplies (like Siemens SITOP). Its low current draw makes it safe to run multiple units in parallel from a single 2A breaker.
| Metric | Performance |
|---|---|
| Speed | 2650 RPM |
| Weight | 0.19 kg |
| Service Life | 70,000 hrs @ 40°C |
| Protection | Reverse Polarity / Locked Rotor |
Why 32mm depth?
The 32mm depth (vs standard 25mm) allows for a steeper blade pitch and larger motor stator, providing higher static pressure capabilities for pushing air through dense filters.
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