Bussmann Time Delay Fuse FRN-R Series 30A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRN-R Series 30A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Professional-Grade Motor and Circuit Protection with Current Limiting Technology

The Bussmann Time Delay Fuse FRN-R Series delivers superior electrical protection and circuit safety for motor circuits and inductive loads. 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 with 30A capacity at 250VAC/125VDC.

Professional Features & Benefits

Advanced Time Delay Protection

• Dual Element Design - Provides time delay characteristics for motor starting currents while offering fast response to short circuits
• 8 Second Response Time at 500% - Allows motor starting surges while protecting against sustained overloads
• Current Limiting Technology - Reduces let-through energy and limits fault current to protect downstream equipment
• 200 kAIC Interrupt Rating at 250VAC - Handles high fault currents safely in industrial and commercial applications

Safety and Standards Compliance

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

Technical Specifications

30 ampere rating with dual voltage capability of 250VAC/125VDC, Class RK5 current limiting fuse with 200 kAIC interrupt rating at 250VAC and 20 kAIC at 125VDC. Ferrule end connections on both terminals, dual element construction with 8 second time delay at 500% rated current. Compact dimensions of 3 inches length by 0.81 inches diameter, weighing 1.95 pounds for standard electrical panel installations.

Installation & Setup

1. Verify power is completely disconnected and use proper lockout/tagout procedures before installation
2. Confirm fuse holder is rated for 30A capacity and Class RK5 fuse dimensions
3. Insert ferrule 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 installation details including fuse rating and installation date for maintenance records

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery with starting surge requirements
• Transformer Primary Protection - Distribution transformers, control transformers, and power supply transformers
• Control Panel Applications - Motor control centers, electrical panels, and industrial control systems
• Lighting Circuit Protection - Commercial lighting systems, ballast protection, and electrical distribution panels
• Industrial Machinery - Manufacturing equipment, processing machinery, and automated systems requiring time delay protection
• Commercial Buildings - Office buildings, retail facilities, and institutional electrical systems
• Power Distribution Systems - Electrical substations, distribution panels, and commercial electrical infrastructure
• HVAC Systems - Air conditioning units, heating systems, and ventilation equipment with motor loads

Dual Element Time Delay Advantage

The dual element design provides superior selective coordination by allowing temporary overloads while quickly clearing dangerous short circuits. The time delay element handles motor starting currents and inrush conditions, while the current limiting element provides fast fault clearing to minimize arc flash hazards and protect downstream equipment from damaging fault currents.

Why Choose Bussmann Quality?

Bussmann commitment to electrical safety includes rigorous testing for NEC compliance, reliable overcurrent protection performance, and professional-grade construction for critical electrical installations. Every FRN-R series fuse delivers consistent time delay characteristics, current limiting protection, and the electrical safety standards that contractors and facility managers trust for motor protection and general purpose applications.