## FNQ-R-1-1/2 Fuse Specifications and Details The **FNQ-R-1-1/2** is a high-performance, industrial-grade fuse. It belongs to the **CC Class** (Current Limiting) family, specifically designed for rejection-type fuse holders to prevent the installation of fuses with lower interrupting ratings. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Manufacturer (Common)** | Bussmann (Eaton) / Littelfuse | | **Amperage Rating** | 1.5 Amps (1-1/2 A) | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Fuse Class** | Class CC | | **Response Characteristic** | Time-Delay (Slo-Blo) | | **Construction** | Melamine tube with nickel-plated brass endcaps | --- ### 2. Functional Characteristics * **Time-Delay Property:** This fuse is designed to handle temporary "inrush currents" or surges (such as when a motor starts) without blowing. It only opens the circuit if the overload persists. * **Current Limiting:** It is a high-speed current-limiting fuse. In the event of a short circuit, it reacts fast enough to limit the total energy (let-through) that could damage downstream components. * **Rejection Feature:** The "R" in the part number signifies a physical rejection tip. This ensures it fits into Class CC fuse blocks, preventing someone from accidentally replacing it with a standard midget fuse that lacks the same safety ratings. --- ### 3. Common Applications The FNQ-R-1-1/2 is typically used in industrial control circuits where space is limited but high protection is required: 1. **Control Transformers:** Protecting the primary side of control power transformers. 2. **Solenoids:** Handling the inductive loads of solenoid valves. 3. **Motor Branch Circuits:** Providing specialized protection for small motor loads. 4. **Lighting Ballasts:** Protecting sensitive electronic ballast circuits. --- ### 4. Comparison: FNQ vs. FNQ-R | Feature | FNQ (Midget) | FNQ-R (Class CC) | | :--- | :--- | :--- | | **Rejection Tip** | No | Yes | | **Interrupting Rating** | 10,000 Amps | 200,000 Amps | | **Application** | General purpose | Branch circuit protection | ---