Overview
The Bussmann FRN-R-600 Fusetron is a Class RK5 dual-element, time-delay, current-limiting fuse designed for demanding industrial and commercial applications. Rated at 600A with an interrupting rating of 200kA at 250Vac and 20kA at 250Vdc, this fuse delivers selective coordination and energy-efficient protection in motor control centers, machinery disconnects, and power distribution systems.
Key Features
- Time-delay protection rated for 10 seconds minimum at 500% of rated current, preventing nuisance trips on motor inrush
- Dual-element, time-delay construction with optional open fuse indication on select ratings
- Class RK5 current-limiting technology minimizes fault damage and reduces arc flash risk
- Rejection-type blade design ensures correct fit and prevents interchangeability errors
- 2:1 selective coordination amp ratio within the RK5 fuse family prevents overcurrent events from opening upstream Fusetron fuses
Technical Specifications
Rated for 250Vac, with 125Vdc (110–200A) and 250Vdc (225–600A) options; interrupting capacity 200kA Vac RMS Sym and 20kA Vdc. Non-indicating cartridge fuse with blade connection type, measuring 2.88″ diameter x 10.38″ length. Weight is 0.11 lb.
Typical Applications
- Motor control centers and combination starters
- Industrial machinery disconnects and branch circuit protection
- Power panelboards and distribution systems
- Heavy-duty equipment requiring time-delay, current-limiting protection
- Control circuits where selective coordination is critical
Compatibility & Replacements
Compatible With
- Allen-Bradley combination starters and motor control centers
- Siemens and Square D panelboards rated for Class RK5 fuses
- General Electric and Eaton disconnect switches with standard blade-type fuse holders
- Industrial automation cabinets and control systems requiring 250Vac/250Vdc protection
Replaces / Drop-In Replacement For
- FRN-R series 600A models (all Class RK5 ratings)
- Cooper Bussmann legacy Fusetron 600A fuses
- Verify exact part compatibility with your equipment specifications before ordering
Works With
- UL/CSA-listed electrical systems and panelboards
- Class RK5 fuse rejection bases and holders
- Motor soft-starters and VFDs requiring upstream current-limiting protection
- NFPA 70 (National Electrical Code) compliant installations
