### KTK-R-20 Electronic Component Overview The **KTK-R-20** is a specialized high-performance industrial fuse. It belongs to the **Limitron™** family and is categorized as a **Class CC** fuse. These fuses are designed specifically for "rejection" style fuse holders, ensuring that a fuse with a lower voltage or interrupting rating cannot be installed in its place. --- ### Technical Specifications | Feature | Specification | |:---|:---| | **Part Number** | KTK-R-20 | | **Current Rating** | 20 Amperes | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps RMS Symmetrical | | **Fuse Class** | Class CC | | **Response Characteristic** | Fast-Acting | | **Body Material** | Melamine (Fiberglass) tube with Nickel-plated brass endcaps | | **Dimensions** | 13/32" x 1-1/2" (10.3mm x 38.1mm) | --- ### Key Features and Design 1. **Rejection Feature:** The KTK-R series features a unique physical shape (a grooved end cap) that fits into Class CC rejection fuse blocks. This prevents the accidental installation of standard non-rejection midget fuses. 2. **Current Limiting:** It is highly current-limiting, meaning it reacts extremely quickly to interrupt a short circuit before the current reaches its full potential peak, protecting sensitive downstream components. 3. **Fast-Acting:** Unlike "Time-Delay" fuses, the KTK-R-20 is designed to blow quickly when an overload occurs. This is critical for circuits without high inductive surges (like motors). --- ### Common Applications * **Control Transformer Protection:** Used to protect the primary side of control transformers. * **Industrial Control Panels (ICP):** Used for branch circuit protection in electrical panels. * **Lighting Ballasts:** Protecting lighting circuits from overcurrent. * **General Purpose Circuits:** Any 600V or less circuit requiring 20A fast-acting protection where high fault currents are possible. --- ### Comparison: KTK vs. KTK-R | Feature | KTK (Standard Midget) | KTK-R (Class CC) | |:---|:---|:---| | **End Cap** | Flat caps | Grooved Rejection Tip | | **Branch Circuit Rated** | No | Yes (UL Listed) | | **Interrupting Rating** | 100kA | 200kA |