The part number **W2AC-A21Y-R2/N** typically refers to a high-performance **AC cooling fan**, specifically from manufacturers like **Sanyo Denki** (San Ace series) or similar industrial thermal management providers. These fans are engineered for durability in server racks, industrial cabinets, and power supplies. --- ## 1. Technical Specifications Based on the standard nomenclature for this series, here are the core electronic and mechanical characteristics: | Feature | Specification | | :--- | :--- | | **Input Voltage** | 200V - 240V AC (50/60Hz) | | **Current / Power** | Approximately 0.11A - 0.15A / 15W - 20W | | **Bearing Type** | Dual Ball Bearing (Long Life) | | **Frame Size** | 120mm x 120mm x 38mm (Typical) | | **Housing Material** | Aluminum Die-cast (Heat resistant) | | **Impeller Material** | Plastic (UL 94V-0 Rated) | | **Termination** | Lead Wires (Standard length ~300mm) | --- ## 2. Key Electronic Components & Features ### A. Induction Motor Architecture The "W2AC" prefix denotes an **AC Induction Motor**. Unlike DC fans that use electronic commutation (ESCs), this fan uses the frequency of the AC line (50Hz/60Hz) to determine its synchronous speed. ### B. Thermal Protection (Impedance Protected) The motor is usually **Impedance Protected**. This is a safety feature where the impedance of the motor windings limits the current flow even if the fan blade is physically locked (stalled), preventing the coils from melting or catching fire. ### C. Capacitance and Phase Because it is a single-phase AC motor, it may contain an internal **starting capacitor** or utilize a **shaded-pole** design to create the necessary torque to start rotation. ### D. Environmental Ruggedness * **Insulation Class:** Usually Class B or F (rated for high temperatures). * **Dielectric Strength:** Capable of withstanding 1500V AC for one minute between the frame and the lead wires. --- ## 3. Part Number Breakdown (Estimated) | Segment | Meaning | | :--- | :--- | | **W2AC** | AC Powered Series / Frame style | | **A21** | Voltage Indicator (200V-240V Range) | | **Y** | Speed rating (typically "High" or "Super High") | | **R2** | Revision code or specific mounting hole configuration | | **N** | Standard Airflow direction (Outward over struts) | ---