The **W2VS-11B-R2** is a high-performance, chassis-mount **AC power line filter** manufactured by **Cosel**. It is designed to suppress electromagnetic interference (EMI) and noise in electrical systems. --- ## 1. Key Specifications The following table highlights the primary electrical characteristics of the W2VS-11B-R2: | Parameter | Specification | | :--- | :--- | | **Rated Voltage** | 250 VAC | | **Rated Current** | 10 Amperes | | **Phase** | Single Phase | | **Leakage Current** | 0.5 mA max (at 250V / 60Hz) | | **Test Voltage** | 2,000 VAC (1 minute, cut-off current 20mA) | | **Operating Temp** | -25°C to +85°C | | **Terminal Type** | Faston® (Tab terminals) | --- ## 2. Internal Electronic Components The "W2VS" series typically utilizes a **Two-Stage** circuit design, which provides superior attenuation compared to single-stage filters. The internal circuitry includes: ### A. Common Mode Chokes * **Function:** High-inductance coils wound on a single core. * **Purpose:** Blocks common-mode noise (noise flowing in the same direction on both lines) while allowing the power current to pass. ### B. X-Capacitors (Line-to-Line) * **Function:** Connected across the phase and neutral lines. * **Purpose:** Suppresses differential-mode noise (noise occurring between the lines). ### C. Y-Capacitors (Line-to-Ground) * **Function:** Connected from each line to the chassis ground. * **Purpose:** Diverts high-frequency common-mode noise to the ground. These are safety-rated to ensure they do not create a shock hazard if they fail. ### D. Discharge Resistor * **Function:** Bleeder resistor connected across the input. * **Purpose:** Ensures that the capacitors are discharged to a safe voltage level shortly after the power is disconnected. --- ## 3. Physical & Mechanical Features * **Casing:** Metallic shield which acts as a Farady cage to prevent the filter itself from radiating or receiving EMI. * **Mounting:** Designed for screw-down chassis mounting to ensure a solid low-impedance ground connection. * **Terminals:** Usually features spade/tab terminals (Faston #250) for quick wiring. --- ## 4. Typical Applications The W2VS-11B-R2 is commonly found in: 1. **Industrial Automation:** Protecting PLCs and sensitive sensors from grid noise. 2. **Medical Equipment:** Reducing interference to sensitive diagnostic tools. 3. **Communication Systems:** Ensuring clean power for servers and networking hardware. 4. **Measuring Instruments:** Preventing power line fluctuations from affecting precision readings.