Bussmann Time Delay Fuse FRN-R Series 70A 250VAC/125VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRN-R Series 70A 250VAC/125VDC Class RK5 Dual Element Blade End

Professional-Grade Electrical Protection with Current Limiting Technology

The Bussmann Time Delay Fuse FRN-R Series 70A 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.

Professional Features & Benefits

Advanced Current Limiting Protection

• Dual Element Design - Provides time delay for motor starting currents while offering fast response to short circuits
• Current Limiting Technology - Reduces let-through energy and peak current during fault conditions for enhanced system protection
• 10 Second Time Delay at 500% - Allows temporary overloads while protecting against sustained overcurrent conditions
• 200 kAIC Interrupt Rating at 250V - Handles high fault currents safely in demanding electrical applications

Safety & Standards Compliance

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

Technical Specifications

70 ampere rating at 250VAC/125VDC, Class RK5 time delay fuse with dual element construction, 200 kAIC interrupt rating at 250V and 20 kAIC at 125VDC, blade end x blade end connection, 10 second time delay at 500% rated current, dimensions 2 inches length x 0.56 inches width x 0.56 inches height, weight 0.5 pounds, non-indicating operation.

Installation & Setup

1. Turn off power and verify zero energy state using proper lockout/tagout procedures before installation
2. Inspect fuse holder and clean contacts to ensure proper electrical connection and heat dissipation
3. Insert fuse with blade ends fully seated in fuse holder clips, ensuring secure mechanical connection
4. Verify proper fuse rating matches circuit requirements and motor full load amperage calculations
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document installation details including fuse rating, installation date, and circuit identification for maintenance records

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery requiring time delay protection
• Transformer Secondary Protection - Distribution transformers, control transformers, and power supply applications
• Control Panel Applications - Motor control centers, electrical panels, and industrial control systems
• Lighting Circuit Protection - High-intensity discharge lighting, fluorescent ballasts, and commercial lighting systems
• Industrial Machinery - Manufacturing equipment, processing machinery, and automated systems
• Commercial Buildings - Office buildings, retail facilities, and institutional electrical systems
• Power Distribution Systems - Electrical distribution panels, switchgear, and load centers
• Electrical Panel Protection - Main panels, sub-panels, and electrical distribution equipment

Dual Element Current Limiting Advantage

Bussmann dual element technology combines time delay characteristics for motor starting with fast-acting short circuit protection. The current limiting design reduces arc energy and system stress during fault conditions, while the 10-second time delay at 500% allows normal motor starting without nuisance tripping, providing selective coordination with upstream protective devices.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, CE marking compliance, and NEC-compliant designs. Our time delay fuses provide reliable overcurrent protection for professional electrical installations, featuring current limiting technology that enhances electrical system safety and reduces maintenance costs while ensuring dependable circuit protection for critical applications.