The **KWN-R-60** is a high-performance industrial fuse manufactured by **Eaton Bussmann**. It is part of the **Limitron™** series and is designed for heavy-duty electrical protection. Below is a detailed breakdown of its electronic and mechanical specifications. --- ## 1. Technical Specifications The KWN-R-60 is a Class R, fast-acting fuse. Its primary role is to provide current limitation to prevent damage to sensitive electrical components during a short circuit. | Feature | Specification | | :--- | :--- | | **Part Number** | KWN-R-60 | | **Amperage Rating** | 60 Amps | | **Voltage Rating (AC)** | 250 VAC | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Fuse Class** | Class RK1 | | **Response Characteristic** | Fast-Acting | | **Body Material** | Melamine / Fiberglass | | **Termination Style** | Cartridge (Ferrule) | --- ## 2. Key Electronic Features ### A. Current Limitation (RK1 Classification) The KWN-R series is classified as **RK1**. This means it provides a higher level of current limitation compared to RK5 fuses. It reacts extremely quickly to overcurrent events, significantly reducing the "Peak Let-Through" current. This protects downstream equipment from thermal and magnetic stress. ### B. High Interrupting Capacity With a rating of **200kA**, this fuse can safely clear very high-magnitude fault currents without exploding or arching over, making it suitable for main service entrances and heavy industrial panels. ### C. Fast-Acting Response Unlike "Time-Delay" fuses (which allow for temporary motor startup surges), the KWN-R-60 is **fast-acting**. It is designed to open almost instantly when its current threshold is exceeded, making it ideal for non-inductive loads. --- ## 3. Physical Dimensions The physical design follows the standardized Class R cartridge format to ensure it fits into standard 60A fuse blocks. * **Length:** 3.0 inches (76.2 mm) * **Diameter:** 0.81 inches (20.6 mm) * **Rejection Feature:** It includes a physical notch in the ferrule. This prevents the installation of lower-rated fuses (like Class H) into Class R fuse clips, ensuring the safety integrity of the circuit. --- ## 4. Common Applications Due to its fast-acting nature and high interruption rating, the KWN-R-60 is typically found in: 1. **Resistive Loads:** Electric heating systems and lighting circuits. 2. **Circuit Breaker Protection:** Used as "backup" protection to increase the Short Circuit Current Rating (SCCR) of a panel. 3. **Control Transformers:** Protecting the primary side of transformers where inrush is not a significant factor. 4. **Branch Circuit Protection:** General-purpose industrial power distribution.