The **FMBC-R91Q-3012** is a high-performance **3-phase line filter** manufactured by **SCHURTER**. It belongs to the FMBC NEO family, designed to suppress electromagnetic interference (EMI) in industrial electrical systems. --- ## 1. Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the component: | Characteristic | Specification | | :--- | :--- | | **Rated Voltage** | 480 / 520 VAC | | **Rated Current** | 30 Amperes | | **Phase Support** | 3-Phase (without neutral) | | **Frequency Range** | 50 / 60 Hz | | **Number of Stages** | 2-Stage Filter (High Attenuation) | | **Termination Type** | Quick-Connect / Screw Terminals | | **Leakage Current** | < 1.0 mA (at 440V/50Hz) | | **Operating Temperature** | -25°C to 100°C | --- ## 2. Key Electronic Components Inside Inside the FMBC-R91Q-3012, several passive components work together to provide noise suppression: ### A. Common Mode Chokes (Toroidal Cores) The device uses high-inductance coils wound on magnetic cores. These are designed to block "Common Mode" noise (noise that flows in the same direction on all phases) by creating high impedance while allowing the 50/60Hz power current to pass through. ### B. X-Capacitors (Line-to-Line) These capacitors are connected between the phases. They are "safety-rated" to filter out **Differential Mode** interference (noise between the individual power lines). ### C. Y-Capacitors (Line-to-Ground) These capacitors bridge the phases to the metal housing (ground). They are critical for bypassing high-frequency noise to the earth. Because this model is a "standard" leakage current version, these capacitors are sized to balance safety and performance. ### D. Discharge Resistors Internally, high-value resistors are placed across the capacitors. Their purpose is to bleed off stored electrical energy once the power is disconnected, preventing electric shock to technicians. --- ## 3. Applications and Usage This filter is typically used in environments where electronic "noise" from high-speed switching could disrupt sensitive equipment: * **Frequency Converters:** Used in motor drives to clean up the output/input. * **Stepper Motor Drives:** Suppressing spikes caused by rapid switching. * **UPS Systems:** Ensuring clean power for uninterruptible supplies. * **Industrial Automation:** Protecting PLCs and sensors from power line pollution. ---