Based on technical specifications, the code **KNP-RU1KDP** refers to a high-power wirewound resistor. These components are designed to handle high current and dissipate heat effectively in industrial or power supply circuits. ### 1. Component Overview The **KNP series** is characterized by its "Wirewound" construction. Unlike film resistors, these use a metal wire (usually Nichrome) wrapped around a ceramic core, providing excellent stability and power handling. | Feature | Specification | | :--- | :--- | | **Type** | Wirewound Resistor | | **Power Rating** | 1 Watt (Standard for Ru1K size) | | **Resistance Value** | 1k $\Omega$ (indicated by "1K") | | **Tolerance** | $\pm 5\%$ (Standard for DP series) | | **Coating** | Flameproof Silicone or Epoxy | --- ### 2. Breakdown of the Part Number The alphanumeric string provides specific details about the component's construction: 1. **KNP**: The series name (High Power Wirewound). 2. **RU**: This usually refers to the **Flameproof** coating and the specific size/dimension standard (Miniature or Standard size). 3. **1K**: The resistance value, which is **1,000 Ohms (1k$\Omega$)**. 4. **DP**: This often denotes the packaging style or a specific lead-wire forming (e.g., **D**ipped/Radial or specialized **P**acking). --- ### 3. Key Technical Characteristics * **Flameproof Protection:** The "RU" designation indicates that the coating will not catch fire even when severely overloaded. It will open the circuit safely. * **High Surge Capacity:** Because it uses actual metal wire, it can withstand much higher instantaneous voltage surges than standard carbon film resistors. * **Temperature Stability:** Wirewound resistors have a low Temperature Coefficient of Resistance (TCR), meaning the resistance doesn't change significantly as the part gets hot. --- ### 4. Typical Applications * **Power Supplies:** Used for inrush current limiting. * **Snubber Circuits:** Used to protect semiconductors from voltage spikes. * **Motor Controllers:** Used for small-scale current sensing or braking. * **Automotive Electronics:** Due to its durability and heat resistance. --- ### 5. Schematic Symbol In a circuit diagram, the KNP-RU1KDP is represented by the standard resistor symbol, often accompanied by a note regarding its wattage: ```text 1k Ohm, 1W ---[=======]--- (KNP Type) ```