Bussmann Time Delay Fuse FRS-R Series 300A 600VAC/300VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRS-R Series 300A 600VAC/300VDC Class RK5 Dual Element Blade End

Heavy-Duty Electrical Protection for High-Current Applications

The Bussmann Time Delay Fuse FRS-R Series 300A delivers superior electrical protection and circuit safety for high-current industrial applications. This Class RK5 time delay fuse features dual element current limiting technology designed for electrical contractors, industrial facilities, and commercial installations, providing the reliable overcurrent protection and industry-leading safety that electrical professionals demand for motor circuits and power distribution systems.

Professional Features & Benefits

Advanced Current Protection

• 300A Current Rating - Handles high-current loads with reliable overcurrent protection for industrial equipment
• Dual Element Design - Provides time delay for motor starting currents while offering fast response to short circuits
• Current Limiting Technology - Reduces let-through energy and arc flash hazards for enhanced electrical safety
• 10 Second Time Delay at 500% - Allows motor starting while protecting against sustained overloads

Safety & Standards Compliance

• Class RK5 Rating - Meets NEC requirements for selective coordination and electrical panel safety
• 200 kAIC Interrupt Rating at 600V - Safely clears high fault currents in industrial power systems
• CE Marked Compliance - Meets international electrical safety standards for global installations

Technical Specifications

300A amperage rating, 600VAC/300VDC voltage rating, 200 kAIC interrupt rating at 600V, 20 kAIC at 300VDC, Class RK5 fuse classification, blade end x blade end connection, dual element construction, 10 second time delay at 500% rated current, dimensions 5" length x 0.81" width x 0.81" height, 0.4 lb weight, non-indicating design for standard electrical panel installations.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before fuse installation
2. Confirm fuse holder is rated for 300A current and Class RK5 fuse dimensions
3. Insert blade ends fully into fuse clips ensuring secure mechanical and electrical connection
4. Verify proper fuse orientation and that connections are tight to prevent arcing
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document fuse installation per NEC requirements and facility maintenance procedures

Professional Applications

Ideal for:

• Motor Protection Circuits - Large industrial motors, compressors, and HVAC equipment requiring time delay protection
• Transformer Primary Protection - Power transformers and distribution transformers in commercial and industrial facilities
• Industrial Control Panels - Main disconnect protection for motor control centers and electrical distribution panels
• Power Distribution Systems - Feeder circuits and branch circuit protection in manufacturing facilities
• Commercial Building Systems - Electrical service entrance protection and main distribution panel applications
• Manufacturing Equipment - Production machinery and automated systems requiring reliable overcurrent protection
• Electrical Service Equipment - Main breaker panels and electrical meter installations
• Heavy Industrial Applications - Steel mills, chemical plants, and other high-current industrial processes

Dual Element Time Delay Advantage

Bussmann dual element technology provides superior selective coordination by allowing harmless temporary overloads while quickly clearing dangerous short circuits. The time delay element handles motor starting currents and other temporary overloads, while the current limiting element provides fast fault clearing to minimize arc flash energy and protect downstream equipment from damage.

Why Choose Bussmann Quality?

Bussmann commitment to electrical safety includes rigorous testing for NEC compliance, reliable overcurrent protection performance, and current limiting technology that reduces arc flash hazards. Every FRS-R series fuse delivers the consistent protection and electrical safety standards that professional electrical contractors and facility managers trust for critical power distribution and motor protection applications.