### FRS-R-1/8 Technical Overview The **FRS-R-1/8** is a high-performance, industrial-grade dual-element time-delay fuse. It belongs to the **Fusetron™** series manufactured by Bussmann (Eaton). It is specifically designed to provide overcurrent protection for circuits with high inrush currents. --- ### Key Specifications | Feature | Specification | | :--- | :--- | | **Current Rating** | 1/8 Amp (0.125A) | | **Voltage Rating (AC)** | 600 Vac | | **Voltage Rating (DC)** | 300 Vdc | | **Interrupting Rating** | 200,000A RMS Symmetrical (AC) | | **Class** | Class RK5 | | **Fuse Type** | Dual-Element, Time-Delay | | **Body Material** | Fiberglass Tube | --- ### Design and Functionality The FRS-R-1/8 is categorized as a **dual-element** fuse. This design provides two distinct levels of protection: 1. **Thermal Cutout:** Handles low-level overloads. It provides a "time-delay" feature that allows temporary surges (like motor startups) to pass without blowing the fuse. 2. **Short-Circuit Element:** A high-speed response element that reacts almost instantaneously to heavy short circuits to protect sensitive equipment and wiring. ### Common Applications * **Motor Protection:** Ideally suited for small motors where the starting current is significantly higher than the running current. * **Transformer Protection:** Used on the primary or secondary side of control transformers. * **Solenoids:** Protects inductive loads that experience frequent cycling. * **General Purpose:** Used in branched circuits where high interrupting capacity is required. ### Features and Benefits * **Current Limiting:** Greatly reduces the "let-through" energy during a fault, protecting downstream components. * **Rejection Feature:** The "R" in the part number indicates a rejection tip, ensuring it can only be used in RK5-compatible fuse holders, preventing the accidental installation of inferior fuses. * **Dual-Voltage Rating:** Rated for both high-voltage AC and DC applications. ---