Bussmann Time Delay Fuse FRN-R Series 250A 250VAC/125VDC Class RK5 Dual Element Blade End Non-Indicating

Bussmann Time Delay Fuse FRN-R Series 250A 250VAC/125VDC Class RK5 Dual Element Blade End Non-Indicating

Heavy-Duty Electrical Protection for High-Current Industrial Applications

The Bussmann Time Delay Fuse FRN-R Series 250A 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 heavy equipment protection.

Professional Features & Benefits

Advanced Current Limiting Protection

• Dual Element Design - Provides time delay for motor starting currents while offering fast response to short circuits
• 250 Ampere Rating - Handles high-current loads up to 250A with reliable overcurrent protection
• Current Limiting Technology - Reduces let-through energy and limits fault current to protect downstream equipment
• 200 kAIC Interrupt Rating - Safely interrupts fault currents up to 200,000 amperes at 250VAC

Safety & Standards Compliance

• Class RK5 Classification - Meets NEC requirements for motor protection and general purpose applications
• CE Marked Compliance - Certified for international electrical safety standards and regulations
• Time Delay Response - 10 second delay at 500% rated current prevents nuisance tripping during motor startup

Technical Specifications

Amperage Rating: 250A, Voltage Rating: 250VAC/125VDC, Interrupt Rating: 200 kAIC at 250VAC/20 kAIC at 125VDC, Fuse Class: RK5, Connection Type: Blade end x blade end, Response Time: 10 seconds at 500% rated current, Element Configuration: Dual element, Indicator: Non-indicating, Dimensions: 1" H x 1" W x 0.5" D, Weight: 0.896 lb, Compliance: CE Marked

Installation & Setup

1. Verify power is completely disconnected and follow lockout/tagout procedures for electrical safety
2. Confirm fuse holder is rated for 250A and Class RK5 fuses with proper blade end connections
3. Insert fuse into holder ensuring proper blade end contact and secure mechanical connection
4. Verify fuse is properly seated and all connections are tight to prevent arcing
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document installation date and fuse specifications for maintenance records and NEC compliance

Professional Applications

Ideal for:

• Motor Protection Circuits - Large industrial motors, pumps, compressors, and HVAC equipment requiring time delay protection
• Transformer Primary Protection - Distribution transformers and power transformers in industrial and commercial facilities
• Industrial Control Panels - Main disconnects and feeder protection in manufacturing and processing equipment
• Power Distribution Systems - Electrical panels, switchgear, and distribution boards in commercial buildings
• Heavy Industrial Machinery - Manufacturing equipment, conveyor systems, and production line protection
• Commercial Building Systems - Elevator motors, escalators, and large HVAC systems requiring high-current protection
• Electrical Service Entrances - Main electrical service protection and feeder circuit applications
• Generator Protection - Backup power systems and emergency generator circuit protection

Dual Element Time Delay Advantage

The Bussmann FRN-R series dual element design provides superior selective coordination by allowing temporary overloads during motor starting while providing fast fault clearing for short circuits. The current limiting technology reduces arc energy and protects downstream equipment from damaging fault currents, while the 10-second time delay at 500% prevents nuisance tripping during normal motor acceleration periods.

Why Choose Bussmann Quality?

Bussmann delivers industry-leading electrical protection with CE marked compliance, proven current limiting technology, and reliable dual element design for professional installations. Our commitment to NEC compliance, selective coordination capability, and consistent overcurrent protection ensures electrical safety and system reliability that electrical contractors and facility managers trust for critical high-current applications.