The **5K7N-R** typically refers to a high-precision, low-profile **Chassis Mount Power Resistor**, most commonly manufactured by brands like **Arcol** or **Ohmite**. These components are designed to dissipate high amounts of heat by utilizing an external heatsink (usually an aluminum chassis). --- ### 1. Key Technical Specifications The "5K7N-R" part number follows a standard industry naming convention. Below is a breakdown of its typical characteristics: | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | HS / NH | Aluminum Housed Resistor | | **Resistance Value** | 5.7k $\Omega$ | Often denoted as 5K7 (5,700 Ohms) | | **Tolerance** | $\pm$ 5% (J) or 1% (F) | "N" or "R" suffixes often indicate RoHS compliance | | **Power Rating** | 5W to 50W+ | Depends on the physical size of the housing | | **Mounting Style** | Chassis Mount | Designed to be bolted to a metal plate | --- ### 2. Physical Construction The 5K7N-R is built to withstand harsh environments and high thermal loads: * **Internal Core:** A ceramic rod or tube wound with a high-quality resistive wire (Wirewound technology). * **Encapsulation:** The internal element is molded into an **anodized aluminum housing**. * **Terminals:** Usually features solder lugs or threaded studs for secure electrical connections. * **Protection:** High insulation resistance and high voltage withstand capabilities. --- ### 3. Applications Because of its ability to handle high power in a small footprint, it is used in: 1. **Braking Resistors:** Used in motor control to dissipate energy when a motor slows down. 2. **Inrush Current Limiting:** Protecting power supplies from spikes when first turned on. 3. **Dummy Loads:** Simulating a real electrical load for testing power amplifiers or batteries. 4. **Voltage Dividers:** High-precision voltage scaling in industrial equipment. --- ### 4. Critical Usage Note: Heat Sinking For this part to reach its rated power (e.g., 25W or 50W), it **must** be mounted on a metal surface using thermal compound. Without a heatsink, the component will overheat and fail even at 25-50% of its rated capacity.