Bussmann Time Delay Fuse FRN-R Series 225A 250VAC/125VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRN-R Series 225A 250VAC/125VDC Class RK5 Dual Element Blade End

Professional-Grade Motor and Transformer Circuit Protection

The Bussmann Time Delay Fuse FRN-R Series 225A delivers superior electrical protection and circuit safety for motor circuits, transformers, and high-inrush 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.

Professional Features & Benefits

Advanced Time Delay Protection

• Dual Element Design - Provides superior time delay characteristics for motor starting and transformer inrush currents
• 10 Second Response at 500% - Allows safe motor starting while protecting against sustained overloads
• Current Limiting Technology - Reduces fault current magnitude and limits arc energy for enhanced safety
• 200 kAIC Interrupt Rating at 250VAC - Handles high fault currents in demanding industrial applications

Safety & Standards Compliance

• UL Listed Class RK5 - Meets stringent electrical safety standards for commercial and industrial use
• NEC Compliant Design - Ensures code compliance for professional electrical installations
• CE Marked - International safety certification for global applications

Technical Specifications

225 ampere rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250VAC, Class RK5 current limiting, dual element construction, blade end x blade end connection, 10 second response time at 500% rated current, 0.56" x 0.56" x 2" dimensions, 0.5 lb weight, non-indicating design for discrete protection.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before installation
2. Confirm fuse holder is rated for 225A and Class RK5 fuses
3. Insert fuse with blade ends fully seated in fuse holder contacts
4. Verify proper connection torque and contact alignment
5. Test installation with appropriate electrical testing equipment
6. Document installation per NEC requirements and facility maintenance records

Professional Applications

Ideal for:

• Motor Protection Circuits - Large motor starters, HVAC equipment, industrial machinery with high starting currents
• Transformer Protection - Distribution transformers, control transformers, isolation transformers
• Industrial Control Panels - Motor control centers, variable frequency drives, soft starters
• Commercial Buildings - Elevator motors, escalator drives, large HVAC systems
• Manufacturing Equipment - Conveyor systems, pumps, compressors, industrial automation
• Power Distribution - Feeder circuits, branch circuits, electrical panels up to 225A
• Lighting Circuits - High-intensity discharge lighting, large lighting contactors
• Electrical Panels - Main disconnects, distribution panels, motor control centers

Dual Element Current Limiting Advantage

Bussmann dual element technology provides superior selective coordination with downstream protective devices while offering time delay for motor starting and current limiting for fault protection. The dual element design combines a fusible link for overload protection with a current limiting element for short circuit protection, ensuring optimal circuit protection and electrical system reliability.

Why Choose Bussmann Quality?

Bussmann commitment to UL listing, NEC compliance, and reliable overcurrent protection makes this fuse the preferred choice for electrical contractors and facility managers. With proven current limiting technology, superior time delay characteristics, and robust construction, Bussmann fuses deliver the electrical safety and protection reliability that professional installations demand.