Bussmann Time Delay Fuse FRN-R Series 100A 250VAC/125VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRN-R Series 100A 250VAC/125VDC Class RK5 Dual Element Blade End

Professional-Grade Motor and Circuit Protection with Current Limiting Technology

The Bussmann Time Delay Fuse FRN-R Series 100A 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
• 100 Ampere Rating - Handles high current motor and industrial loads 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 protects downstream equipment from fault damage

Safety & Standards Compliance

• Class RK5 Performance - Meets NEC requirements for motor branch circuit protection with selective coordination
• 200 kAIC at 250V Rating - High interrupt capacity clears dangerous fault currents safely and reliably
• CE Marked Compliance - Meets international electrical safety standards for global installations

Technical Specifications

100 ampere rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250V, 20 kAIC at 125VDC, Class RK5 fuse classification, blade end x blade end connection, 10 second time delay at 500% rated current, dual element construction, non-indicating design, dimensions 0.54" x 0.54" x 2.1", weight 0.5 lb, standard packaging.

Installation & Setup

1. Turn off power and verify zero energy state using proper lockout/tagout procedures
2. Remove existing fuse using appropriate fuse pullers to avoid contact with live parts
3. Inspect fuse holder contacts for corrosion, damage, or loose connections before installation
4. Insert new fuse ensuring proper blade end alignment and full contact engagement
5. Verify secure mounting and proper fuse holder closure before energizing circuit
6. Test circuit operation and verify proper motor starting characteristics and protection coordination

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery protection
• Transformer Primary Protection - Distribution transformers, control transformers, and power supply protection
• Industrial Control Panels - Motor control centers, variable frequency drives, and automation equipment
• Commercial HVAC Systems - Rooftop units, chillers, boilers, and building automation systems
• Manufacturing Equipment - Production machinery, material handling systems, and process control equipment
• Power Distribution Systems - Electrical panels, switchgear, and load centers requiring motor circuit protection
• Lighting Circuit Protection - High-intensity discharge lighting and large lighting contactors
• Electrical Panel Applications - Main panels, sub-panels, and distribution boards in commercial facilities

Current Limiting Technology Advantage

Bussmann's advanced current limiting technology in the FRN-R series provides superior arc suppression and fault current limitation, reducing let-through energy during short circuit conditions. This protects downstream equipment from thermal and magnetic stresses while enabling selective coordination with upstream protective devices for reliable electrical system operation.

Why Choose Bussmann Quality?

Bussmann's commitment to electrical safety excellence ensures every FRN-R fuse meets stringent UL listing requirements and NEC compliance standards. With proven dual element time delay technology and current limiting performance, these fuses provide the reliable overcurrent protection and selective coordination that electrical professionals trust for critical motor and industrial circuit applications.