Description
The NMB 11938MB-A1N-EA-00 (legacy cross-reference: 4715MS-12T-B50-A00) is an industrial-grade AC axial cooling fan engineered for high-reliability thermal management in power distribution cabinets, automation systems, and industrial equipment. Operating on a 115 VAC rated voltage at 50/60 Hz with a low 75 VAC starting voltage, this standard 119 x 119 x 38 mm (4.69 x 4.69 x 1.50 inches) unit features a rugged die-cast aluminum frame paired with a dual ball bearing system. Powered by a shaded pole induction motor with built-in impedance protection, it delivers up to 2900 RPM speed, generating a max. airflow of 103.6 CFM (2.93 m³/min) at a quiet 41.0 dB(A) acoustic noise level. Designed with quick-connect 2-pin terminals and an extended L10 life expectancy of 100,000 hours at 25°C, it holds global UL, CSA, VDE, and CE agency approvals.
Key Features
- Standard 119 x 119 x 38 mm (4.69 x 4.69 x 1.50 inches) industrial form factor with a heavy-duty die-cast aluminum casing.
- Efficient shaded pole induction motor delivering 103.6 CFM (2.93 m³/min) max. airflow and 0.31 inH2O (76.4 Pa) max. static pressure at 60 Hz.
- Reliable 75 VAC low starting voltage ensures dependable impeller startup under variable supply conditions.
- Quick-connect terminal electrical termination (2-pin terminal style) for simplified harness connection and field replacement.
- Precision dual ball bearing architecture rated for an extended L10 life expectancy of 100,000 hours at 25°C ambient.
- Internal impedance motor protection prevents winding damage during stall or locked-rotor conditions.
- High-grade electrical insulation (Min. 100 MΩ @ DC 500V) and AC 1800V dielectric withstand voltage rating.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | NMB (MinebeaMitsumi) |
| Manufacturer Part Number (MPN) | 11938MB-A1N-EA-00 |
| Legacy Cross Reference | 4715MS-12T-B50-A00 |
| Product Series | 11938MB Series (4715MS) |
| Fan Type | AC Axial Cooling Fan |
| Physical Dimensions (L x W x H) | 119 x 119 x 38 mm (4.69 x 4.69 x 1.50 inches) |
| Frame & Impeller Material | Aluminum Die-Cast Frame / Plastic Impeller (UL 94V-0) |
| Electrical Termination | Quick-Connect Terminals (2-Pin Terminal) |
| Rated Voltage | 115 VAC |
| Frequency | 50 / 60 Hz |
| Starting Voltage | 75 VAC |
| Rated Current | 0.25 A / 0.21 A |
| Rated Power | 15.5 W / 14.5 W |
| Rated Speed | 2600 / 2900 RPM |
| Max. Airflow | 89.3 / 103.6 CFM (2.53 / 2.93 m³/min) |
| Max. Static Pressure | 0.26 / 0.31 inH2O (64.7 / 76.4 Pa) |
| Acoustic Noise Level | 37.0 / 41.0 dB(A) |
| Bearing Type | Dual Ball Bearing |
| Motor Type | Shaded Pole Induction Motor |
| Motor Protection | Impedance Protection |
| Insulation Resistance | Min. 100 MΩ @ 500 VDC |
| Dielectric Withstand Voltage | AC 1800 V for 3 sec |
| Operating Temperature | -10°C to +70°C (14°F to 158°F) |
| Storage Temperature | -40°C to +70°C (-40°F to 158°F) |
| Life Expectancy (L10) | 100,000 Hours @ 25°C |
| Agency Approvals | UL, CSA, VDE, CE |
| Net Weight | 500 g (1.10 lbs) |
Applications
- Thermal management in electrical switchgear cabinets, automation enclosures, and motor drive racks.
- Forced-air ventilation for industrial power supplies, transformers, and inverter assemblies.
- Heat dissipation in telecom distribution racks, server enclosures, and power distribution units.
- Cooling for commercial HVAC systems, medical diagnostic equipment, and CNC machine controls.
Frequently Asked Questions & Technical Support
What is the starting voltage for the NMB 11938MB-A1N-EA-00?
The fan is rated for a low starting voltage of 75 VAC, allowing the motor to reliably initiate rotation even under line voltage dips or power supply fluctuations prior to reaching full 115 VAC operation.
How does impedance protection operate on this shaded pole motor?
Impedance motor protection relies on the inherent AC impedance of the motor windings. If the fan impeller becomes mechanically locked or obstructed, the electrical impedance restricts current draw, preventing coil overheating and thermal insulation failure.
What electrical connection style does the “EA” suffix denote?
The “EA” designation indicates a 2-pin quick-connect terminal interface. It accepts standard push-on AC fan power cords or female quick-disconnect spade terminals for solderless installation and rapid maintenance.
How can I request 3D CAD files or submit a volume RFQ for 11938MB-A1N-EA-00?
Design engineers and purchasing agents can request STEP 3D CAD models, official factory datasheets, or volume RFQ quotes by submitting a request with the target MPN (11938MB-A1N-EA-00) and required batch quantities to our technical sales team.
Specifications
| Manufacturer | NMB Technologies |
|---|---|
| Fan Size | 120 x 120 x 38 mm |
| Voltage Rated | 115 VAC |
| Cooling Type | Axial Fan |
| Air Flow Range | 50 – 150 CFM ( 85 – 255 m³/h ) |
| Static Pressure Range | 2.5 – 10 mmH₂O ( 25 – 100 Pa ) |
| Fan Speed Range | 2,000 – 4,500 RPM |
| Noise | 30 – 45 dB(A) (Standard) |
| Shipping Weight | 1 kg |
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