Bussmann Time Delay Fuse FRN-R Series 90A 250VAC/125VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRN-R Series 90A 250VAC/125VDC Class RK5 Dual Element Blade End

Professional-Grade Motor and Circuit Protection with Current Limiting Technology

The Bussmann Time Delay Fuse FRN-R Series 90A delivers superior electrical protection and circuit safety for motor circuits 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 time delay for motor starting currents while offering fast response to short circuits
• 10 Second Response at 500% - Allows motor starting while protecting against sustained overloads
• Current Limiting Technology - Reduces let-through energy and protects downstream equipment from fault damage
• 200 kAIC Interrupt Rating at 250V - Handles high fault currents safely in demanding electrical applications

Safety and Standards Compliance

• Class RK5 Classification - Meets NEC requirements for motor protection and selective coordination
• CE Marked Certification - Ensures compliance with international electrical safety standards
• Non-Indicating Design - Provides reliable protection without visual indication for standard applications

Technical Specifications

90 ampere rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250V and 20 kAIC at 125VDC, Class RK5 current limiting fuse, blade end x blade end connection, 10 second time delay at 500% rated current, dual element construction, dimensions 5 inches length x 0.81 inches width x 0.81 inches height, weight 0.15 pounds, non-indicating operation.

Installation & Setup

1. Turn off power and verify zero energy state using proper lockout/tagout procedures
2. Remove existing fuse using appropriate fuse pullers and safety equipment
3. Inspect fuse holder contacts for corrosion, damage, or loose connections
4. Insert new Bussmann FRN-R fuse ensuring proper blade end alignment and full insertion
5. Verify secure connection and proper fuse holder engagement
6. Restore power and test circuit operation following NEC guidelines

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, compressor motors, and industrial drive applications
• Transformer Primary Protection - Distribution transformers, control transformers, and power supply circuits
• Industrial Control Panels - Motor control centers, variable frequency drives, and automation systems
• Commercial Lighting Circuits - High-intensity discharge lighting, fluorescent ballasts, and LED driver protection
• Power Distribution Systems - Panelboards, switchboards, and electrical distribution equipment
• HVAC Equipment Protection - Air handling units, chillers, boilers, and building automation systems
• Manufacturing Equipment - Production machinery, conveyor systems, and process control applications
• Electrical Panel Applications - Main breaker panels, sub-panels, and electrical service equipment

Current Limiting Technology Advantage

Bussmann FRN-R series fuses utilize advanced current limiting technology that significantly reduces let-through energy during fault conditions. The dual element design provides superior selective coordination with upstream and downstream protective devices, while the time delay characteristic accommodates motor starting currents and other high-inrush loads. This combination ensures reliable circuit protection while minimizing nuisance tripping and equipment damage.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, CE marking compliance, and adherence to NEC standards. Every FRN-R series fuse delivers reliable overcurrent protection with proven current limiting performance, ensuring electrical contractors and facility managers can trust their critical circuit protection applications. The dual element design and Class RK5 classification provide the selective coordination and motor protection capabilities essential for professional electrical installations.