Bussmann FRS-R-20 Fusetron Dual-Element Time-Delay Class RK5 Fuse (Box of 6) The Bussmann FRS-R-20 Fusetron fuse is a 20-amp, 600-volt, dual-element, time-delay fuse designed to provide superior protection for circuits subject to temporary motor overloads and surge currents. This Class RK5 fuse is ideal for applications such as combination starters, motor control centers, machinery disconnects, and power panelboards. Key Features Dual-Element Design: Offers both high-performance short-circuit and overload protection, allowing for closer sizing to full-load amperes and enhanced protection of motors and transformers. Time-Delay Capability: Provides a minimum 10-second delay at 500% of the rated current, accommodating temporary inrush currents without nuisance openings. Current Limiting: Limits the let-through energy during fault conditions, helping to protect downstream components from high fault currents. High Interrupting Rating: Rated for 200,000 amperes interrupting capacity (AIC) at 600 VAC and 20,000 AIC at 300 VDC, ensuring reliable performance in demanding environments. Versatile Application: Suitable for use in a wide range of industrial settings, including motor protection and power distribution systems. Specifications Amperage Rating: 20 A Voltage Rating: 600 VAC / 300 VDC Interrupting Rating: 200 kA at 600 VAC; 20 kA at 300 VDC Fuse Class: RK5 Body Size: 0.81 inches in diameter x 5 inches in length Element: Dual Response Time: 10 seconds at 500% of rated current Material: Fiberglass Mounting Type: Holder Terminal Type: Ferrule Standards & Approvals: UL 248-12, Class RK5, Guide JDDZ, File No. E4273; CSA C22.2 No. 248.12, Class 1422-02, File No. 53787; CE Certified; RoHS Compliant Each box contains six FRS-R-20 fuses, providing a reliable solution for maintaining the safety and efficiency of your electrical systems.