Description
The ebm-papst 3214J/39NU (also known as 3214J39NU) is a high-performance compact brushless DC axial cooling fan engineered within a standard 92 × 92 × 38 mm (3.62 × 3.62 × 1.50 in) form factor. Operating on a nominal 24 VDC supply (with an operational window of 11.0 to 28.0 VDC), this unit delivers an aerodynamic output of 76.5 CFM (130.0 m³/h) and generates up to 205 Pa (0.823 in H₂O) of maximum static back pressure at 6,000 RPM. Built with glass-fiber reinforced plastic housing and impeller assemblies suspended on precision dual ball bearings, it ensures continuous, vibration-isolated thermal control across any mounting orientation. Electrical and monitoring architecture includes integrated locked-rotor auto-restart, reverse polarity protection via a rectifying diode, and an open-collector low-state active alarm circuit routed through three discrete 310 mm AWG 24 leads.
Key Features
- Aerodynamic High-Pressure Profile: Delivers 76.5 CFM (130.0 m³/h) airflow and 205 Pa back pressure for densely packed industrial enclosures.
- Integrated /39 Alarm Signal: Open-collector low-signal circuit provides real-time rotational fault status for host controller monitoring.
- Locked-Rotor Auto-Restart: Automatically pulses drive current every 8.2 seconds during rotor blockage to safeguard windings from burnout.
- Heavy-Duty Bearing System: Precision dual ball bearing assembly enables arbitrary shaft orientation and 70,000-hour operational life at 40°C.
- Reverse Polarity Shielding: Internal rectifying diode network suppresses terminal reverse voltage faults and limits residual current to 10 mA.
Technical Specifications
| Manufacturer | ebm-papst |
|---|---|
| Manufacturer Part Number (MPN) | 3214J/39NU |
| Alternate Part Number | 3214J39NU |
| Product Series | 3200J (S-Force) |
| Product Category | DC Axial Fans |
| Fan / Component Type | Brushless DC Tubeaxial Fan |
| Phase & Supply Type | Single-Phase DC |
| Rated Voltage | 24 VDC |
| Operating Voltage Range | 11.0 to 28.0 VDC |
| Rated Speed | 6,000 RPM |
| Speed at Minimum Voltage (11 VDC) | 2,780 RPM |
| Speed at Maximum Voltage (28 VDC) | 6,650 RPM |
| Power Rating (Nominal) | 6.5 W |
| Power Consumption at 11 VDC | 1.3 W |
| Power Consumption at 28 VDC | 9.5 W |
| Rated Current | 0.270 A (270 mA) |
| Current Draw at 11 VDC | 115 mA |
| Current Draw at 28 VDC | 340 mA |
| Max. Current Draw (Starting / Blocked) | < 2,250 mA |
| Locked Rotor Current | approx. 2,250 mA |
| Max. Airflow | 76.5 CFM (130.0 m³/h) |
| Max. Static Pressure | 0.823 in H₂O (205 Pa) |
| Optimal Operating Airflow Point | 51.8 CFM (88.0 m³/h) |
| Optimal Operating Pressure Point | 0.261 in H₂O (65 Pa) |
| Noise Level (Sound Pressure) | 51.0 dB(A) |
| Sound Power Level | 6.1 bel(A) |
| Airflow Direction | Air outlet over struts |
| Direction of Rotation | Clockwise looking at rotor |
| Bearing Type | Ball bearing |
| Mounting Position / Shaft Orientation | Any (Horizontal or Vertical) |
| Dimensions (L × H × D) | 92.0 × 92.0 × 38.0 mm (3.62 × 3.62 × 1.50 in) |
| Weight | 0.240 kg (0.529 lbs) |
| Housing Material | Plastic |
| Impeller Material | Plastic |
| Mounting Fastener Specification | ISO 4762 – M4 (degreased, without additional brace or washer) |
| Max. Mounting Flange Torque | 30 N·cm (wire outlet and remaining corners) |
| Termination & Cable Specs | 3 discrete lead wires, AWG 24, length 310 mm (±10 mm), insulation Ø 1.50 mm |
| Wiring Pinout / Connection | Pin 1: Red (+UB), Pin 2: Blue (-GND), Pin 3: White (Alarm Signal) |
| Control / Signal Interface | /39 Alarm (Low = OK, Open Collector, external pull-up resistor Ra required) |
| Alarm Operating Voltage (UBA) | ≤ 30.0 VDC |
| Alarm Signal Low Voltage (UA low) | ≤ 0.4 VDC (at Isink = 2 mA) |
| Alarm Signal High Voltage (UA high) | 30.0 VDC |
| Alarm Leakage Current | 15 µA |
| Alarm Trip Speed Limit (nG) | 0 RPM (Speed-loss / Rotor-lock trigger) |
| Motor Protection | Electronic locked-rotor auto restart and rectifying diode polarity protection |
| Auto-Restart Clock Cycle (t3 / t4) | 0.1 s run / 8.2 s delay (typical) |
| Max. Reverse Polarity Residual Current (IF) | ≤ 10 mA |
| Electrical Protection Class | Class III (acc. to EN 60950 / VDE 0805) |
| Dielectric Strength (Type Test) | 500 VAC for 1 min (after 48 h at 95% RH, 25°C) |
| Insulation Resistance | RI > 10 MΩ (measured at 500 VDC after 48 h at 95% RH, 25°C) |
| Clearance / Creepage Distance | 1.0 mm / 1.2 mm |
| Ingress / Exposure Check Level | IP5X dust check & IPX4 splash check (acc. to DIN EN 60529 / VDE 0470, uncertified) |
| Pollution Degree | Pollution Degree 3 (DIN EN 60664-1) |
| Operating Temperature Range | -20 °C to +60 °C (-4 °F to +140 °F) |
| Storage Temperature Range | -40 °C to +80 °C (-40 °F to +176 °F) |
| Climatic / Humidity Testing | DIN EN 60068-2-38 (cyclic humid heat, 10 cycles) & DIN EN ISO 6270-2 (14 days condensation) |
| Service Life (L10 at 40 °C) | 70,000 hours |
| Safety Certifications & Approvals | UL507, CSA C22.2 No. 113, VDE (EN 60950), CE, EAC, RoHS compliant |
Applications
The ebm-papst 3214J/39NU compact tubeaxial fan is deployed across demanding thermal management subsystems including telecommunication base station transceivers, network power rectifiers, and high-density industrial server chassis. It is widely installed by machine builders in variable frequency drive (VFD) enclosures, programmable logic controller (PLC) processor racks, automated assembly line power distribution panels, and high-output industrial laser controllers. Furthermore, its rugged construction and open-collector alarm interface make it a standard MRO replacement component within medical diagnostic imaging carts, commercial power conversion inverters, and precision robotic servo drive assemblies.
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