Overview
The Bussmann FRN-R-600 Class RK5 Fusetron fuse is a current-limiting, dual-element time-delay fuse designed for industrial and commercial electrical systems requiring Class RK5 protection. This fuse provides 600 A capacity with an interrupting rating of 200 kA at 250 Vac and 20 kA at 250 Vdc. The dual-element construction allows selective coordination with upstream protection devices, minimizing nuisance trips and system downtime in motor circuits and branch distribution applications.
Key Features
- Time-delay characteristic of 10 seconds (minimum) at 500% of rated current for protection against temporary overload surges
- Current-limiting, dual-element design reduces let-through energy and stress on connected equipment
- 200 kA interrupting rating at 250 Vac, meeting UL Class RK5 standards
- Non-indicating blade-type terminals for quick installation in standard fuse blocks
- cULus Listed for North American compliance
Technical Specifications
The FRN-R-600 offers the following electrical and physical characteristics:
- Current Rating: 600 Amps
- Voltage Rating: 250 Vac, 125 Vdc (110-200A), 250 Vdc (225-600A)
- Interrupting Rating: 200 kA Vac RMS Symmetrical, 20 kA Vdc
- Class: RK5
- Time Delay: 10 seconds (minimum) at 500% of rated current
- Element Type: Dual-element
- Dimensions: 2.88″ × 10.38″
- Terminal Type: Blade end X blade end
- Certifications: UL 248-12 Class RK5, CSA C22.2 No. 248.12, CE
Typical Applications
Class RK5 fuses like the FRN-R-600 are widely used in:
- Industrial motor control circuits requiring selective coordination
- Branch distribution panels in manufacturing facilities
- Large equipment feeders where time-delay is essential to prevent nuisance trip-outs
- Power distribution systems requiring current limitation to minimize arc-flash energy
Compatibility & Replacements
Compatible With
- Standard Class RK5 fuse blocks and holders rated for 600 A service
- Industrial electrical panels and motor control centers
- Power distribution equipment requiring UL 248-12 Class RK5 fuses
- Selective coordination schemes within the Bussmann RK5 fuse family
Replaces / Drop-In Replacement For
The FRN-R-600 directly replaces other Bussmann Fusetron 600 A Class RK5 fuses of the same voltage rating (250 Vac) and time-delay characteristic. Always verify voltage class and interrupting rating requirements with your system design documentation before substitution.
Works With
- Bussmann RM600 series fuse blocks (1-pole, 2-pole, and 3-pole configurations)
- Class RK5-rated electrical distribution systems
- UL 248-12 and CSA C22.2 No. 248.12 compliant panel designs
- Industrial automation control circuits in manufacturing and process control environments
