The **KTN-R-20** is a specific model of industrial power fuse manufactured by **Eaton Bussmann**. It belongs to the **Limitron™** series and is widely used for protecting electrical circuits from overcurrent and short-circuit events. --- ## Technical Specifications The following table summarizes the key electrical characteristics of the KTN-R-20: | Feature | Specification | | :--- | :--- | | **Model Number** | KTN-R-20 | | **Ampere Rating** | 20 Amps | | **Voltage Rating** | 250 VAC | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Fuse Class** | Class RK1 | | **Speed/Response** | Fast-Acting | | **Material** | Melamine tube with silver-plated end caps | --- ## Key Features and Components ### 1. Fast-Acting Response Unlike "Time-Delay" fuses (which allow for temporary motor startup surges), the KTN-R-20 is **Fast-Acting**. This means it responds almost instantaneously to overcurrents, providing high-level protection for sensitive electronic components. ### 2. Class RK1 Classification The "R" in KTN-R stands for **Rejection**. These fuses have a physical rejection feature (a groove in the end cap) that prevents them from being replaced by a fuse with a lower interrupting rating (like Class H or K), ensuring the safety of the system is maintained. ### 3. High Interrupting Capacity With a rating of **200kA**, this fuse can safely interrupt very high fault currents without exploding or damaging the surrounding equipment. --- ## Common Applications The KTN-R-20 is typically found in the following environments: * **Branch Circuit Protection:** Standard electrical distribution. * **Resistive Loads:** Such as electric heating systems where there are no high-inrush currents. * **Control Transformers:** Protecting the primary side of small transformers. * **Lighting Circuits:** Industrial and commercial lighting panels. --- ## Dimensions and Installation The KTN-R-20 is a **Cartridge Style** fuse. * **Diameter:** 0.56 inches (14.3mm) * **Length:** 2.0 inches (50.8mm) It is designed to fit into standard 30A, 250V fuse blocks that accept Class R fuses.