Little-fuse RK5 Fuse 200KA

Description:

The Little-fuse RK5 Fuse is used in industrial electrical protection systems to safeguard circuits from overloads and short-circuit faults. It is a dual-element, time-delay current-limiting fuse designed to allow short inrush currents (such as motor starts) while providing fast interruption under fault conditions. Commonly installed in motor control centers, industrial panels, transformers, switchboards, and feeder circuits where high interrupting capacity and selective coordination are required to protect electrical equipment and wiring systems.

Applications:

The Little-fuse RK5 fuse is commonly used in industrial power distribution systems, motor control circuits, HVAC equipment, transformers, and general-purpose electrical panels in commercial and manufacturing facilities where high fault current protection (up to 200 kA AC interrupting rating) is required to ensure safe operation and equipment protection under overload and short-circuit conditions.

Technical Specifications:

• Manufacturer: Little-fuse
• Model / Part number: RK5 Class fuse
• Product type: Current-limiting dual-element time-delay fuse
• Voltage rating: 600 V AC / 300 V DC
• Current rating: 1 A to 600 A (series dependent)
• Interrupting rating: Up to 200 kA RMS symmetrical AC
• DC interrupting rating: Up to 20 kA DC
• Fuse type: RK5 Class, dual-element, time-delay
• Construction: Fiberglass body with metal end caps
• Function: Overcurrent and short-circuit circuit protection
• Mounting: Fuse block or clip-style industrial fuse holder
• Application environment: Industrial electrical distribution systems
• Standards: UL 248-12, CSA certified

Common Replacements:

• Little-fuse FLNR series RK5 time-delay fuse
• Bussmann FRS-R / FRN-R Class RK5 fuse equivalents
• Mersen (FERRAZ Shawmut) TR-R / AJT series industrial fuses