The **FNQ-R-1** is a high-performance industrial fuse belonging to the **Limitron™** family, manufactured by Eaton (Bussmann Series). It is specifically designed as a "Time-Delay" branch circuit fuse. --- ## 1. Technical Specifications The table below summarizes the core electrical characteristics of the FNQ-R-1: | Feature | Specification | | :--- | :--- | | **Model Number** | FNQ-R-1 | | **Current Rating** | 1 Amp | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Fuse Class** | Class CC | | **Response Time** | Time-Delay (Slow Blow) | | **Material** | Melamine tube with Nickel-plated brass endcaps | --- ## 2. Key Electronic Features ### A. Rejection Feature As a **Class CC** fuse, the FNQ-R-1 features a physical "rejection tip." This is a specific groove on one end of the fuse that prevents lower-rated fuses (like Midget fuses) from being installed into a Class CC fuse holder. This ensures that the circuit remains protected by a high-interrupting-capacity fuse. ### B. Time-Delay Characteristics Unlike "Fast-Acting" fuses, the FNQ-R-1 is engineered to handle **inrush currents**. * It can withstand temporary surges (common when starting motors or energizing transformers). * It will only blow if the overcurrent persists, protecting against sustained overloads and short circuits. ### C. High Interrupting Rating With a **200kA AIC** (Amps Interrupting Capacity), this fuse is capable of safely clearing very high fault currents without exploding or arcing, which is critical for industrial safety compliance (NEC requirements). --- ## 3. Common Applications The FNQ-R-1 is primarily used in the following electronic and electrical environments: 1. **Control Transformers:** Protecting the primary side of industrial control transformers where high inrush currents are expected. 2. **Motor Control Circuits:** Providing branch circuit protection for small motors. 3. **Solenoids and Inductive Loads:** Circuits that have high "turn-on" energy spikes. 4. **Lighting Ballasts:** Protection for industrial lighting systems. --- ## 4. Identification and Dimensions * **Diameter:** 13/32" (approx. 10.3 mm) * **Length:** 1-1/2" (approx. 38.1 mm) * **Color Coding:** Typically features an orange label to indicate Class CC rejection capabilities.