The **KTK-R-1/8** is a specialized industrial fuse manufactured by Eaton’s Bussmann Division. It belongs to the **Limitron™** series and is designed for high-performance protection in control circuits. --- ## 1. Technical Specifications The following table outlines the core electrical characteristics of the KTK-R-1/8: | Feature | Specification | | :--- | :--- | | **Model Number** | KTK-R-1/8 | | **Amperage Rating** | 1/8 Amp (0.125A) | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Fuse Class** | Class CC | | **Body Material** | Melamine Tube | | **Contact Material** | Nickel-plated Bronze Endcaps | | **Response Speed** | Fast-Acting | --- ## 2. Key Physical Features ### Class CC Rejection Feature The "R" in the model name indicates that this fuse is a **Rejection-type** fuse. * It features a unique physical rejection tip on the endcap. * This prevents the installation of lower-rated fuses (like standard 13/32" midget fuses) into a Class CC fuse holder, ensuring the safety of the circuit is maintained. ### Compact Size * **Diameter:** 13/32 inch (10.3 mm) * **Length:** 1-1/2 inches (38.1 mm) --- ## 3. Applications and Usage The KTK-R-1/8 is specifically engineered for circuits requiring high-speed response to overcurrents. Common applications include: 1. **Control Circuit Transformers:** Providing primary protection where high fault currents may be present. 2. **Lighting Fixtures:** Protecting ballast circuits. 3. **Specialized Instrumentation:** Shielding sensitive electronic components that cannot tolerate even brief surges. 4. **Industrial Control Panels:** Used in environments requiring UL listed Branch Circuit protection. --- ## 4. Comparison: Fast-Acting vs. Time-Delay Unlike the **LP-CC** series (which are time-delay), the **KTK-R** series is **fast-acting**. This means it will blow almost instantly upon reaching a threshold current. It is **not** recommended for inductive loads with high "in-rush" currents (like motor starters) unless the amperage is sized appropriately to handle the peak.