Bussmann Time Delay Fuse FRS-R Series 400A 600VAC/300VDC Class RK5 Dual Element Blade End Non-Indicating

Bussmann Time Delay Fuse FRS-R Series 400A 600VAC/300VDC Class RK5 Dual Element Blade End Non-Indicating

Heavy-Duty Electrical Protection for High-Current Industrial Applications

The Bussmann Time Delay Fuse FRS-R Series delivers superior electrical protection and circuit safety for high-current industrial applications up to 400 amperes. 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 for motor circuits, transformer protection, and power distribution systems.

Professional Features & Benefits

Advanced Current Limiting Protection

• 400 Ampere Rating - Handles high-current loads with reliable overcurrent protection for industrial equipment
• Dual Element Design - Provides time delay characteristics for motor starting while offering fast response to short circuits
• Class RK5 Current Limiting - Reduces let-through energy and limits fault current to protect downstream equipment
• 200 kAIC Interrupt Rating - Safely clears high fault currents up to 200,000 amperes at 600VAC

Safety & Standards Compliance

• UL Listed Construction - Meets rigorous electrical safety standards for professional installations
• NEC Compliant Design - Ensures code compliance for electrical panel and power distribution applications
• CE Marked Certification - International safety approval for global electrical installations

Technical Specifications

400 ampere rating, 600VAC/300VDC voltage rating, Class RK5 current limiting, 200 kAIC interrupt rating at 600VAC, 20 kAIC at 300VDC, dual element time delay design, 10 second response time at 500% rated current, blade end connections, non-indicating design, dimensions 1.06" x 1.06" x 5.5", weight 3 pounds, standard packaging for professional installations.

Installation & Setup

1. Verify power is completely disconnected and use proper lockout/tagout procedures before installation
2. Inspect fuse holder and blade connections for proper alignment and secure mounting
3. Insert fuse into holder ensuring blade ends make full contact with fuse clips
4. Verify proper fuse class and amperage rating matches circuit protection requirements
5. Test installation with appropriate electrical testing equipment before energizing
6. Document installation details and fuse specifications for maintenance records

Professional Applications

Ideal for:

• Motor Protection Circuits - Large industrial motors, pumps, compressors, and HVAC equipment requiring time delay protection
• Transformer Circuits - Primary and secondary protection for power and distribution transformers
• Industrial Control Panels - Main disconnect protection and feeder circuit protection in control systems
• Power Distribution Systems - Electrical panels, switchgear, and distribution boards in commercial facilities
• Manufacturing Equipment - Production machinery, conveyor systems, and automated equipment protection
• Commercial Buildings - HVAC systems, lighting panels, and electrical distribution in office complexes
• Industrial Facilities - Heavy machinery protection, process equipment, and plant electrical systems
• Electrical Panels - Main breaker panels, sub-panels, and distribution equipment in industrial settings

Current Limiting Technology Advantage

Bussmann's advanced current limiting technology in the FRS-R series provides superior arc suppression and fault clearing capability, reducing let-through energy to protect downstream equipment from damage. The dual element design offers selective coordination with upstream and downstream protective devices, ensuring only the faulted circuit is isolated while maintaining power to healthy circuits.

Why Choose Bussmann Quality?

Bussmann's commitment to UL listing, NEC compliance, and reliable overcurrent protection makes the FRS-R series the trusted choice for electrical professionals. With proven current limiting technology, robust construction, and comprehensive safety certifications, these fuses deliver the electrical safety and system reliability that industrial facilities and commercial installations demand for critical power protection applications.