Bussmann Time Delay Fuse FRN-R Series 25A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRN-R Series 25A 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 25A capacity at 250VAC/125VDC.

Professional Features & Benefits

Advanced Time Delay Protection

• Dual Element Design - Provides time delay characteristics with 8 second response at 500% rated current for motor starting protection
• Current Limiting Technology - Reduces let-through energy and peak current during fault conditions for enhanced circuit protection
• Class RK5 Performance - Delivers reliable overcurrent protection with selective coordination capabilities for electrical system reliability
• 200 kAIC Interrupt Rating - Handles high fault currents at 250VAC with superior arc suppression and fault clearing capability

Safety and Compliance Standards

• UL Listed Construction - Meets rigorous electrical safety standards for professional installations and NEC compliance
• CE Marked Certification - Ensures international electrical safety compliance for global applications
• Non-Indicating Design - Provides reliable protection without visual indication for standard electrical panel installations

Technical Specifications

25 ampere current rating, 250VAC/125VDC voltage rating, Class RK5 time delay classification, 200 kAIC interrupt rating at 250V, 20 kAIC at 125VDC, dual element construction, ferrule end connections, 8 second time delay at 500% rated current, 0.81 inch diameter, 3 inch length, 1.95 pound weight, non-indicating operation, current limiting performance.

Installation & Setup

1. Verify electrical system is de-energized and follow lockout/tagout procedures for safe fuse installation
2. Confirm fuse holder compatibility with ferrule end connections and Class RK5 fuse dimensions
3. Check amperage and voltage ratings match circuit requirements (25A, 250VAC/125VDC)
4. Install fuse with proper orientation ensuring secure ferrule end contact in fuse holder
5. Verify all connections are tight and properly seated for reliable electrical contact
6. Test circuit operation and confirm proper overcurrent protection functionality

Professional Applications

Ideal for:

• Motor Protection Circuits - Time delay characteristics accommodate motor starting currents while providing overload protection
• Industrial Control Panels - Reliable overcurrent protection for control circuits and automation systems
• Commercial Lighting Systems - Circuit protection for lighting panels and distribution equipment
• HVAC Equipment Protection - Motor and compressor circuit protection with time delay for starting surges
• Power Distribution Systems - Branch circuit protection in electrical panels and switchgear
• Transformer Secondary Circuits - Overcurrent protection for transformer output circuits and distribution
• Electrical Panel Applications - Main and branch circuit protection in commercial and industrial panels
• Machinery and Equipment - Industrial equipment protection with selective coordination capabilities

Current Limiting Technology Advantage

Bussmann current limiting technology reduces peak let-through current and energy during fault conditions, minimizing damage to downstream equipment and enhancing electrical system safety. The dual element design provides time delay for motor starting while maintaining fast response to short circuit faults, ensuring optimal protection coordination in electrical installations.

Why Choose Bussmann Quality?

Bussmann commitment to UL listing, NEC compliance, and reliable overcurrent protection makes this time delay fuse the preferred choice for electrical professionals. With proven current limiting performance, superior fault clearing capability, and consistent time delay characteristics, Bussmann fuses deliver the electrical safety and system reliability that contractors and facility managers demand for critical electrical installations.