The **W2AC-A21B-R** is a specific industrial-grade AC axial fan component, typically manufactured by brands like **CUI Devices** or specialized thermal management companies. It is designed for high-performance cooling in enclosures, server racks, and industrial machinery. --- ### 1. Technical Specifications The following table highlights the core electronic and physical attributes of the W2AC-A21B-R: | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 220 ~ 240V AC | | **Frequency** | 50 / 60 Hz | | **Input Power** | ~20W - 24W (typical for this series) | | **Rated Speed** | ~2700 - 3000 RPM | | **Bearing Type** | Dual Ball Bearing (for long life) | | **Airflow** | High-volume axial flow | | **Material** | Aluminum Die-cast frame / PBT Plastic Impeller | | **Termination** | Lead Wires or Terminal blocks (depending on sub-variant) | --- ### 2. Electronic Components & Features The internal electronics of this unit are built to handle high-voltage alternating current and provide thermal protection: * **Shaded Pole Motor:** Most AC fans in this series utilize a shaded-pole induction motor. These are reliable, have no brushes to wear out, and are self-starting. * **Impedance Protection:** The motor windings are electronically designed to limit current if the fan becomes stalled (locked rotor). This prevents the unit from catching fire or overheating during a mechanical failure. * **EMI Suppression:** High-quality variants often include internal capacitors to minimize electromagnetic interference (EMI) feedback into the power line. * **Ball Bearing System:** Unlike sleeve bearings, the dual ball bearing system inside allows the fan to be mounted in any orientation (horizontal, vertical, or angled) without affecting lifespan. --- ### 3. Application Use-Cases The **W2AC-A21B-R** is generally used in environments requiring 24/7 operation: 1. **Industrial Control Panels:** Cooling PLCs and power supplies. 2. **Server Cabinets:** Exhausting hot air from high-density computing racks. 3. **HVAC Equipment:** Used as a booster or cooling fan for heat exchangers. 4. **Medical Equipment:** Cooling high-powered diagnostic machines. --- ### 4. Safety & Compliance * **RoHS Compliant:** The "R" suffix usually denotes compliance with RoHS standards (Restriction of Hazardous Substances). * **UL/TUV/CE Certification:** Designed to meet international safety standards for industrial electrical components.