Bussmann Time Delay Fuse FRS-R Series 250A 600VAC/300VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRS-R Series 250A 600VAC/300VDC Class RK5 Dual Element Blade End

Professional-Grade Motor and Transformer Circuit Protection

The Bussmann FRS-R Series Time Delay Fuse delivers superior electrical protection and circuit safety for high-amperage motor and transformer 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 Current Limiting Protection

• 250A Current Rating - Handles high-amperage loads with reliable overcurrent protection for industrial motor circuits
• Dual Element Design - Provides time delay characteristics for motor starting while offering fast fault clearing capability
• Current Limiting Technology - Reduces let-through energy and limits fault current to protect downstream equipment and conductors
• 10 Second Time Delay at 500% - Allows motor starting transients while clearing sustained overloads and short circuits

Safety and Standards Compliance

• Class RK5 Performance - Meets NEC requirements for motor branch circuit protection with selective coordination capability
• 200 kAIC Interrupt Rating at 600VAC - Safely clears high fault currents in industrial power distribution systems
• CE Marked Compliance - Meets international electrical safety standards for global installations

Technical Specifications

250 ampere current rating, 600VAC/300VDC voltage rating, 200 kAIC interrupt rating at 600VAC, Class RK5 current limiting performance, blade end connection type, dual element construction, 10 second time delay at 500% rated current, non-indicating design, compact 5.0" x 0.81" x 0.81" dimensions, 0.4 lb weight for easy installation in electrical panels and switchgear.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before fuse installation or replacement
2. Confirm fuse holder and electrical panel ratings match 250A current and 600VAC voltage specifications
3. Insert blade ends fully into fuse clips ensuring secure mechanical and electrical connection
4. Verify proper fuse orientation and that blade connections are tight and properly seated
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document fuse installation and maintain electrical safety records per NEC requirements

Professional Applications

Ideal for:

• Motor Protection Circuits - Large industrial motors, pumps, compressors, and HVAC equipment requiring time delay protection
• Transformer Primary Protection - Distribution transformers and power transformers in commercial and industrial facilities
• Industrial Control Panels - Motor control centers, variable frequency drives, and automation equipment protection
• Power Distribution Systems - Switchgear, panelboards, and electrical distribution equipment in manufacturing facilities
• Commercial Building Systems - Elevator motors, escalators, and large building mechanical equipment
• Process Equipment Protection - Manufacturing machinery, conveyor systems, and industrial processing equipment
• Electrical Panel Applications - Main breaker panels, sub-panels, and electrical distribution boards
• High-Amperage Circuits - Feeder circuits, branch circuits, and electrical service entrance applications

Current Limiting Technology Advantage

Bussmann current limiting technology provides superior arc suppression and fault energy reduction compared to standard fuses. The dual element design offers selective coordination with downstream protective devices while the Class RK5 performance ensures reliable motor starting capability and fast fault clearing for comprehensive electrical system protection.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, NEC compliance, and current limiting innovation. Every FRS-R series fuse delivers reliable overcurrent protection, superior fault clearing capability, and the electrical safety performance that professional contractors and facility managers trust for critical motor and transformer protection applications.