## KTK-R-1 Fuse: Technical Specifications and Overview The **KTK-R-1** is a high-performance, industrial-grade fuse belonging to the **Limitron™** series, manufactured by **Bussmann (Eaton)**. It is a **Class CC** fuse designed for fast-acting protection in branch circuits. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Current Rating** | 1 Amp | | **Voltage Rating** | 600 Vac (or less) | | **Interrupting Rating** | 200,000 Amps RMS Symmetrical | | **Fuse Class** | Class CC | | **Response Speed** | Fast-Acting | | **Material** | Melamine tube with Nickel-plated brass endcaps | | **Dimensions** | 13/32" x 1-1/2" (10.3mm x 38.1mm) | --- ### 2. Design Features * **Rejection Feature:** The "R" in KTK-R signifies a rejection tip. This prevents the installation of lower-rated fuses (like standard midget fuses) into a Class CC fuse holder, ensuring the safety level of the circuit is maintained. * **Current Limitation:** As a Class CC fuse, the KTK-R-1 is highly current-limiting. It reacts extremely quickly to high-magnitude faults, "clearing" the circuit before the peak current can reach a level that would damage sensitive downstream components. * **Compact Size:** It follows the standard "Midget" form factor but with the added safety of the rejection tip. --- ### 3. Common Applications The KTK-R-1 is typically used in environments where high available fault currents are present. Common use cases include: 1. **Control Transformer Protection:** Used on the primary side of control transformers. 2. **Lighting Circuitry:** Protecting specialized lighting ballasts or branch circuits. 3. **General Purpose Circuits:** Ideal for any 600V or less application requiring fast-acting response without time-delay characteristics. 4. **Industrial Control Panels (ICPs):** Used to meet UL 508A requirements for branch circuit protection. --- ### 4. Comparison with Similar Fuses | Series | Type | Primary Use Case | | :--- | :--- | :--- | | **KTK-R** | Fast-Acting (Class CC) | General purpose, resistive loads, high fault current areas. | | **FNQ-R** | Time-Delay (Class CC) | Inductive loads, motor circuits, circuits with high inrush. | | **LP-CC** | Time-Delay (Class CC) | Ultimate protection (Dual-element) for maximum safety. |