The **FAS-02-R** is an electronic component primarily known as a **Filter and Surge Protection Module**, often used in conjunction with AC-DC power supplies (such as the Cosel series). Its main function is to reduce electromagnetic interference (EMI) and protect sensitive electronics from voltage surges. --- ## 1. Core Technical Specifications The following table outlines the primary electrical characteristics of the FAS-02-R: | Parameter | Specification | | :--- | :--- | | **Rated Voltage** | AC 250V / DC 250V | | **Rated Current** | 2A | | **Test Voltage (Withstand)** | 2,000V AC (1 minute) | | **Isolation Resistance** | 500VDC 100MΩ min | | **Operating Temperature** | -40 to +85°C | | **Safety Approvals** | UL, C-UL, ENEC | --- ## 2. Key Electronic Components & Internal Functions The "R" suffix typically denotes a specific terminal or mounting configuration (often related to DIN rail or specific pin layouts). Internally, the device consists of several critical stages: ### A. EMI/RFI Filtering The unit contains a network of **Inductors (Chokes)** and **Capacitors** (X and Y types): * **Common Mode Choke:** High-impedance coils that suppress noise common to both power lines. * **X-Capacitors:** Connected across the lines to suppress differential mode noise. * **Y-Capacitors:** Connected from line to ground to bypass high-frequency noise to the earth. ### B. Surge Protection The module includes **Metal Oxide Varistors (MOVs)** or Gas Discharge Tubes. These components act as high-speed "clamping" devices. When a voltage spike (like a lightning strike or switching surge) hits the line, the MOV drops its resistance instantly to shunt the excess energy away from the load. ### C. Attenuation Characteristics The FAS-02-R is designed for high-attenuation performance across a wide frequency band: * Effective in the **150kHz to 30MHz** range. * Provides significant reduction in conducted emissions to help equipment meet **CISPR** and **FCC Class B** standards. --- ## 3. Physical Layout and Terminal Connection The FAS-02-R is compact and designed for easy integration. ```text Input Terminals (AC/DC) -----> [ Internal Filter ] -----> Output Terminals (Line, Neutral, FG) [ Surge Absorber ] (Filtered Power) ``` 1. **Input Side:** Connects to the raw power source. 2. **FG (Frame Ground):** Must be connected to a solid earth ground for the surge protection and Y-capacitors to function correctly. 3. **Output Side:** Connects directly to the input of the power supply or sensitive electronic device. ---