The **MEH74XBA-R** is a specific model of an **AC/DC Axial Fan**, typically manufactured by **Fulltech Electric**. These fans are widely used in industrial cooling, server racks, and power supply systems. --- ### 1. Technical Specifications Below are the primary electronic and mechanical characteristics of the MEH74XBA-R: | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 115V AC (Standard) | | **Frequency** | 50 / 60 Hz | | **Current (Amp)** | ~0.24A to 0.26A | | **Power Consumption** | ~18W to 22W | | **Speed (RPM)** | ~2,700 to 3,100 RPM | | **Airflow (CFM)** | ~100 to 115 CFM | | **Bearing Type** | Dual Ball Bearing | | **Frame Material** | Die-cast Aluminum | --- ### 2. Key Electronic Components The internal architecture of this fan consists of several critical electronic parts that manage power and rotation: * **Shaded Pole or Capacitor-Run Motor:** The "Heart" of the unit. It converts the alternating current into electromagnetic force to spin the rotor. * **Stator Windings:** High-quality copper coils that generate the magnetic field. In "XBA" series fans, these are often protected by Class B or Class F insulation to withstand heat. * **Dual Ball Bearings:** While mechanical, they are essential for the electronic efficiency of the motor, reducing friction and preventing the motor from overheating due to resistance. * **Thermal Protector:** Most models include an internal impedance protector or a thermal cutoff to prevent the motor from burning out if the blades are obstructed (locked rotor). * **Lead Wires/Terminals:** Typically equipped with two AWG wires or fast-on terminals for AC power input. --- ### 3. Part Number Breakdown (Nomenclature) Understanding the "MEH74XBA-R" prefix helps identify its specific electronic capabilities: * **MEH:** High-efficiency series identifier. * **74:** Relates to the frame size and thickness (Commonly 120mm x 120mm x 38mm). * **X:** High-speed performance designation. * **B:** Indicates **Ball Bearing** (longer lifespan than sleeve bearings). * **A:** AC Voltage (115V). * **-R:** Often signifies **RoHS Compliance** or a specific **Reverse Airflow** / Terminal configuration. --- ### 4. Typical Applications Because of its AC power input and high CFM (Cubic Feet per Minute), it is found in: 1. **Industrial Control Panels:** Heat dissipation for PLCs and Inverters. 2. **Server Cabinets:** Maintaining airflow across rack-mounted hardware. 3. **Medical Equipment:** Cooling high-output power supplies. ---