The part number **48NV-2RBHA-R** refers to a high-performance **Brushless DC (BLDC) Cooling Fan**, typically manufactured by companies like **NMB-Technologies (MinebeaMitsumi)**. This specific series is engineered for high-pressure cooling in server racks, telecommunications equipment, and industrial power supplies. --- ### 1. Technical Specifications Based on the standard nomenclature for this series, here are the primary electronic and mechanical characteristics: | Parameter | Specification | | :--- | :--- | | **Voltage - Rated** | 48V DC | | **Operating Voltage Range** | 28.0V ~ 56.0V DC | | **Current (Typical)** | ~1.10A to 1.50A (Varies by sub-model) | | **Power Consumption** | ~50W - 75W Range | | **Speed (RPM)** | High Speed (Often 10,000+ RPM) | | **Bearing Type** | Dual Ball Bearing (Long Life) | | **Dimensions** | 120mm x 120mm x 38mm (Standard Rack Mount Size) | | **Termination** | Lead Wires (usually 4-wire for PWM/Tach) | --- ### 2. Key Electronic Features The "2RBHA-R" suffix indicates a specific configuration of control electronics integrated into the fan's PCB: * **Integrated Drive Circuit:** Uses a 3-phase sensorless or Hall-effect drive system to manage the brushless motor commutation. * **PWM Control (Pulse Width Modulation):** Allows the system (like a server motherboard) to precisely control the fan speed based on temperature, significantly reducing noise and power consumption at low loads. * **Tachometer Output (Frequency Generator):** Provides a feedback signal to the system to monitor the actual RPM and detect if the fan has stalled or failed. * **Locked Rotor Protection:** The electronics will automatically cut power or attempt restarts if the blades are physically obstructed, preventing the motor coils from burning out. * **Reverse Polarity Protection:** Prevents damage if the positive and negative power leads are accidentally swapped. --- ### 3. Structural & Material Components * **Casing:** PBT Plastic (UL94V-0 reinforced) or Aluminum Die-cast for high-heat environments. * **Impeller:** Aerodynamically optimized blades designed to provide high static pressure, essential for pushing air through dense heat sinks or filtered chassis. * **Ball Bearings:** High-precision stainless steel bearings rated for L10 life spans of 70,000+ hours at 40°C. --- ### 4. Application Use-Cases * **Data Centers:** Cooling for 1U/2U server enclosures. * **Inverters:** Cooling for large-scale solar or industrial power converters. * **Telecom:** Used in outdoor base stations where high reliability and 48V rail compatibility are standard.