The part number **47NLN-R** typically refers to a specific series of high-performance, chassis-mount power resistors, often associated with brands like **Ohmite** or specialized industrial component manufacturers. These components are designed to handle significant power loads while maintaining a small physical footprint. --- ### 1. Key Technical Specifications Below is a general profile for the 47NLN-R series (based on standard industrial data for wirewound aluminum housed resistors): | Feature | Description | | :--- | :--- | | **Component Type** | Wirewound Power Resistor | | **Housing** | Aluminum Housed (Chassis Mount) | | **Resistance Tolerance** | Typically ±1% or ±5% | | **Power Rating** | Varies by size (Commonly 10W to 50W) | | **Termination Style** | Solder Lug / Axial Leads | | **Suffix "-R"** | Indicates **RoHS Compliance** (Lead-Free) | --- ### 2. Functional Characteristics * **Heat Dissipation:** The aluminum housing is designed to be bolted directly to a metal chassis or heat sink. This allows the resistor to dissipate heat much more effectively than standard ceramic resistors. * **Non-Inductive (NL):** The "NL" in the part number often signifies a **Non-Inductive** winding. In standard wirewound resistors, the wire coil creates inductance. "Non-inductive" versions use an **Ayrton-Perry winding** (two wires wound in opposite directions) to cancel out magnetic fields, making them suitable for high-frequency applications. * **Stability:** These parts are engineered for high stability under harsh environmental conditions, featuring high insulation resistance and dielectric strength. --- ### 3. Common Applications 1. **Load Banks:** Used to simulate electrical loads for testing power supplies. 2. **Motor Control:** Used as braking resistors to dissipate energy when a motor slows down. 3. **Audio Equipment:** Used in crossover networks or as dummy loads for amplifiers where low inductance is critical for sound purity. 4. **Industrial Power Supplies:** Acting as "bleeder resistors" to safely discharge capacitors after power-off. --- ### 4. Mounting & Installation Tips * **Thermal Paste:** For maximum power efficiency, apply a thin layer of thermal grease between the resistor base and the mounting surface. * **De-rating:** If the resistor is used without a heat sink (in free air), its power handling capacity drops significantly (often by 50% or more). * **Clearance:** Ensure enough space around the component as the aluminum body can become extremely hot during operation. ---