Bussmann Time Delay Fuse FRN-R Series 45A 250VAC/125VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRN-R Series 45A 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 45A delivers superior electrical protection and circuit safety for motor circuits and industrial 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 Motor Protection

• Dual Element Design - Provides time delay for motor starting currents while offering fast response to short circuits
• 45A Current Rating - Handles substantial motor loads and industrial equipment with reliable overcurrent protection
• 10 Second Time Delay at 500% - Allows motor starting transients while protecting against sustained overloads
• Current Limiting Technology - Reduces let-through energy and minimizes arc flash hazards during fault conditions

Safety & Standards Compliance

• Class RK5 Performance - Meets NEC requirements for motor branch circuit protection with selective coordination capability
• 200 kAIC Interrupt Rating at 250VAC - Safely clears high fault currents in industrial power distribution systems
• CE Marked Compliance - Meets international electrical safety standards for global installations

Technical Specifications

45A amperage rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250VAC, 0.81" x 0.81" x 3" dimensions, Class RK5 fuse classification, ferrule end connections, 10 second response time at 500% rated current, dual element construction, non-indicating design, 3.1 lb weight.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before installation
2. Confirm fuse holder is rated for 45A and Class RK5 fuses per NEC requirements
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
6. Document installation per electrical code requirements and facility maintenance procedures

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery requiring time delay protection
• Industrial Control Panels - Motor control centers, variable frequency drive protection, and automation equipment
• Commercial Buildings - Elevator motors, escalator drives, and building automation systems
• Manufacturing Equipment - Production machinery, material handling systems, and process control equipment
• Power Distribution - Feeder circuits, branch circuits, and electrical panel protection in industrial facilities
• Transformer Circuits - Primary protection for control transformers and distribution transformers
• Lighting Circuits - High-intensity discharge lighting and large lighting panel protection
• Electrical Panels - Main panels, sub-panels, and distribution boards requiring reliable overcurrent protection

Dual Element Current Limiting Advantage

Bussmann dual element technology combines time delay overload protection with fast-acting short circuit protection, providing superior motor circuit protection. The current limiting design reduces arc flash energy and enables selective coordination with downstream protective devices, ensuring only the faulted circuit is isolated while maintaining power to critical systems.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, NEC compliance, and reliable overcurrent protection solutions. Our Class RK5 time delay fuses provide the current limiting performance and selective coordination capability that electrical contractors and facility managers trust for professional motor protection installations.