Littelfuse FLSR 50 Class RK-5 Slo-Blo Fuse The Littelfuse FLSR 50 is a 50-amp, 600-volt, Class RK5 time-delay fuse designed to provide superior overcurrent protection for a wide range of industrial applications. Its dual-element, time-delay construction ensures reliable performance, especially in circuits containing motors. Key Features Dual-Element Design: Enhances protection against both short circuits and overloads, ensuring consistent and accurate response to overcurrent conditions. Time-Delay Functionality: Allows temporary inrush currents, such as those during motor startups, without unnecessary fuse operation. High Interrupting Rating: Capable of interrupting fault currents up to 200,000 amperes at 600V AC, providing robust protection against high fault currents. Current Limiting: Restricts the let-through energy during fault conditions, minimizing potential damage to equipment. Specifications Current Rating: 50 Amperes Voltage Rating: 600V AC / 300V DC Interrupting Rating: 200,000 AIC at 600V AC; 20,000 AIC at 300V DC Body Dimensions: 5-1/2 inches in length; 1-1/16 inches in diameter Body Material: Composite with bronze caps Compliance: UL 248-12, CSA Certified, Federal Specification WF-1814 Applications The FLSR 50 fuse is ideal for various applications, including: Service entrance switches Transformers Switchboard mains and feeders Motor control center mains and motor branch circuits General-purpose circuits Its reliable performance and robust design make it a preferred choice for protecting electrical systems in industrial settings.