The **W2AC-A31A-R** is a specific model within the **W2AC Series** of AC power entry modules, typically manufactured by companies like **InPower** or related power electronics firms. It is designed to bridge the gap between an external AC power source and the internal DC circuitry of an electronic device. --- ## 1. Component Overview The W2AC-A31A-R is more than just a plug; it is an integrated **Power Entry Module (PEM)**. It combines several critical electronic functions into a single shielded housing to save space and improve safety. ### Key Specifications | Feature | Description | | :--- | :--- | | **Input Type** | AC Power (Universal 100-240V typically) | | **Connector Type** | IEC 60320 C14 (Male Inlet) | | **Mounting** | Screw mount or Snap-in (model dependent) | | **Current Rating** | Usually rated for 10A to 15A | | **Compliance** | RoHS compliant (indicated by the "-R" suffix) | --- ## 2. Internal Electronic Parts The unit consists of three primary electronic sub-assemblies: ### A. EMI/RFI Filter The core electronic function is electromagnetic interference (EMI) filtering. * **Capacitors (X and Y):** These suppress "line-to-line" (differential mode) and "line-to-ground" (common mode) noise. * **Inductors/Chokes:** Ferrite cores with copper windings that block high-frequency noise from entering or leaving the device. ### B. Overcurrent Protection (Fuse Holder) The module includes a built-in compartment for a glass or ceramic fuse. * **Function:** Protects the internal electronics from power surges or short circuits. * **Format:** Often designed for 5x20mm fuses. ### C. Switch Mechanism The "A31A" designation often refers to the specific configuration of the rocker switch. * **DPST (Double Pole, Single Throw):** This allows the switch to disconnect both the Hot (Line) and Neutral wires simultaneously for maximum safety. * **Illumination:** Many versions include a neon or LED lamp inside the switch to indicate when power is active. --- ## 3. Pinout and Connection The back of the module features terminals for connecting to the internal power supply: ```markdown Terminal L --> Line (Hot) wire to Internal PSU Terminal N --> Neutral wire to Internal PSU Terminal G --> Chassis Ground (Earth) ``` --- ## 4. Part Number Breakdown (Typical) * **W2AC:** Series designation (AC Power Entry). * **A31A:** Configuration code (Indicates specific filter type, switch type, and mounting style). * **-R:** **RoHS Compliant.** This ensures the part is manufactured without hazardous substances like lead or cadmium.