Description
The Delta THA0412BN is a heavy-duty 40 x 40 x 28 mm (1.575 x 1.575 x 1.102 in) high-static-pressure tubeaxial DC cooling fan engineered for thermally saturated enterprise enclosures. Powered by a single-phase, 8-pole brushless motor, it delivers an aerodynamic output of 29.52 CFM (50.15 m³/h) and a peak static back pressure of 2.40 in H₂O (598.8 Pa) at 19,000 RPM while consuming a nominal 10.68 W at 12 VDC. Its structural construction pairs a rugged die-cast aluminum frame with a UL 94V-0 flame-retardant plastic impeller and a precision dual ball bearing system rated for 70,000 hours of continuous operation at 40 °C. Factory connectivity features a 335 mm 4-wire lead assembly providing dedicated open-collector frequency generator (tachometer) feedback alongside 25 kHz PWM variable speed control.
Key Features
- High-Static-Pressure Aerodynamics: Generates up to 2.40 in H₂O of head pressure to overcome dense system airflow impedance.
- Die-Cast Aluminum Frame: Rigid metal housing minimizes structural resonance and guarantees dimensional integrity under extreme operational stress.
- Precision Dual Ball Bearings: Heavy-duty dual ball bearing system ensures a continuous maintenance-free service life of 70,000 hours at 40 °C.
- Advanced Thermal Control: Integrated 25 kHz pulse-width modulation input enables dynamic closed-loop acoustic and cooling speed modulation.
- Open-Collector Tachometer Output: Four-pulse-per-revolution frequency generator line provides real-time rotation monitoring and locked-rotor detection for host controllers.
Technical Specifications
| Manufacturer | Delta |
|---|---|
| Manufacturer Part Number (MPN) | THA0412BN |
| Product Series | THA Series |
| Product Category | DC Axial Fans |
| Fan / Component Type | Brushless DC Tubeaxial Fan |
| Motor Architecture | Brushless DC, Single-Phase, 8 Poles |
| Phase & Supply Type | Direct Current (DC) |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 7.0 VDC to 13.2 VDC |
| Nominal Input Current | 0.89 A |
| Max. Current Draw | 1.32 A |
| Nominal Input Power | 10.68 W |
| Max. Input Power | 15.84 W |
| Nominal Speed (RPM) | 19,000 RPM |
| Maximum Airflow | 29.52 CFM (50.15 m³/h / 0.83 m³/min) |
| Minimum Guaranteed Airflow | 26.56 CFM (45.13 m³/h / 0.75 m³/min) |
| Maximum Static Pressure | 2.40 in H₂O (598.8 Pa / 61.06 mmH₂O) |
| Minimum Guaranteed Static Pressure | 2.16 in H₂O (538.9 Pa / 54.95 mmH₂O) |
| Acoustical Noise Level (Average) | 59.0 dB(A) |
| Max. Acoustical Noise Level | 63.0 dB(A) |
| Dimensions (L × H × D) | 40.0 × 40.0 × 28.0 mm (1.575 × 1.575 × 1.102 in) |
| Mounting Hole Pitch | 32.0 ± 0.3 mm (1.260 in) |
| Mounting Hole Diameter | 8 × Ø 3.5 ± 0.3 mm (8 × Ø 0.138 in) |
| Frame Material | Die-Casting Aluminum |
| Impeller Material | Plastic (UL 94V-0 Rated) |
| Bearing Type | Dual Ball Bearings |
| Direction of Rotation | Clockwise (viewed from nameplate / strut side) |
| External Housing Cover | Open Type |
| Weight | 46 g (0.101 lbs / 1.62 oz) |
| Termination & Cable Specs | 4 Lead Wires, UL 1061 AWG #26, Length 335.0 ± 10.0 mm (13.19 ± 0.39 in) |
| Wiring Pinout / Connection | Red: Positive (+), Black: Negative (-), Blue: Frequency (FO/FG Tachometer), Yellow: Speed Control (PWM) |
| Control / Signal Features | PWM Speed Control (0-10 VDC signal, 25 kHz preferred), Open-Collector FG Tachometer |
| Tachometer (FG) Signal Specification | Vce Max: 13.2 V, Ic Max: 5 mA, Vce(sat) Max: 0.5 V, 4 pulses/revolution (8 transitions/rev) |
| PWM Duty Cycle Response | 100% Duty = 19,000 RPM (1.10 A ref); 0% Duty = 0 RPM (0.02 A ref); Dead-stop restart at 25% duty |
| Motor Protection | Locked Rotor Protection (96h fire protection), Polarity Protection (reverse connection capable) |
| Insulation Type | UL: Class A |
| Insulation Resistance | 10 MΩ min. at 500 VDC (between frame and positive terminal) |
| Dielectric Strength | 5 mA max. at 500 VAC 50/60 Hz for 1 minute (between frame and positive terminal) |
| Operating Temperature Range | -10 °C to +70 °C (14 °F to 158 °F) |
| Storage Temperature Range | -40 °C to +75 °C (-40 °F to 167 °F) |
| Operating Humidity Range | 5% to 90% RH (non-condensing) |
| Storage Humidity Range | 5% to 95% RH |
| Service Life Expectancy (L10) | 70,000 Hours continuous operation at 40 °C (15% to 65% RH) |
| Standards & Compliance | cURus, CE, TUV, RoHS Compliant, Zero ODS (no PBBs, PBBOs, CFCs, PBBEs, PBDPEs, HCFCs) |
Applications
The Delta THA0412BN tubeaxial fan is deployed across high-density 1U rack-mount chassis, carrier-grade network switches, optical line terminals, and modular server blade backplanes where extreme packaging density restricts cooling passages. Its die-cast metal frame and high static head make it an essential thermal solution for hot-swappable power supply units (PSUs), cellular base station transceivers, and industrial automation edge gateways subjected to constant vibration and elevated ambient operating temperatures. Maintenance engineers and system integrators routinely select this fan for targeted spot cooling across GPU heatsinks, FPGA accelerator cards, and medical imaging controller mainboards.
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