Bussmann Time Delay Fuse FRN-R Series 150A 250VAC/125VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRN-R Series 150A 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 150A delivers superior electrical protection and circuit safety for motor circuits and high-inrush 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 Time Delay Protection

• Dual Element Design - Provides superior time delay characteristics with 10 second response at 500% rated current for motor starting protection
• Current Limiting Technology - Reduces peak let-through current and energy to protect downstream equipment from fault damage
• 150 Ampere Rating - Handles high current loads up to 150A with reliable overcurrent protection for industrial applications
• Blade End Connection - Secure blade-to-blade connection system ensures reliable electrical contact and easy installation

Safety & Standards Compliance

• Class RK5 Certification - UL listed Class RK5 design meets NEC requirements for motor and general purpose circuit protection
• 200 kAIC Interrupt Rating - High fault current interrupting capacity at 250VAC provides superior short circuit protection
• CE Marked Compliance - Meets international electrical safety standards for global installation requirements

Technical Specifications

150 ampere rating, 250VAC/125VDC voltage rating, 200 kAIC interrupt rating at 250VAC, Class RK5 time delay characteristics, dual element construction, blade end x blade end connection, 10 second response time at 500% rated current, 2.1 inch length x 0.54 inch width x 0.54 inch height dimensions, 0.5 lb weight, non-indicating design for discrete protection.

Installation & Setup

1. Verify power is completely disconnected and use proper lockout/tagout procedures before installation
2. Confirm fuse holder is rated for 150A and Class RK5 fuses with proper blade end connections
3. Insert fuse into holder ensuring blade ends make secure contact with fuse clips
4. Verify proper fuse orientation and secure mounting in electrical panel or disconnect
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document fuse installation and rating for maintenance records and NEC compliance

Professional Applications

Ideal for:

• Motor Protection Circuits - Large motor starters, HVAC equipment, industrial machinery with high starting currents
• Transformer Protection - Primary protection for distribution transformers and power supplies up to 150A
• Industrial Control Panels - Main disconnect protection for control systems and automation equipment
• Commercial Lighting Circuits - High-capacity lighting panels and ballast protection in commercial facilities
• Power Distribution Systems - Feeder protection in electrical panels and distribution boards
• HVAC Equipment Protection - Air conditioning units, heat pumps, and ventilation system motor protection
• Manufacturing Equipment - Production machinery, conveyor systems, and industrial process equipment
• Electrical Service Panels - Main and branch circuit protection in commercial and industrial electrical systems

Current Limiting Technology Advantage

Bussmann's advanced current limiting technology in the FRN-R series provides superior arc suppression and fault clearing capability, reducing peak let-through current to protect sensitive downstream equipment. The dual element design combines fast short circuit protection with time delay characteristics for motor starting, ensuring selective coordination in electrical distribution systems while maintaining reliable overcurrent protection.

Why Choose Bussmann Quality?

Bussmann's commitment to UL listing and NEC compliance ensures reliable overcurrent protection for professional electrical installations. With decades of electrical safety innovation, Class RK5 time delay fuses provide the trusted protection electrical contractors and facility managers depend on for motor circuits, industrial equipment, and commercial electrical systems requiring superior fault clearing and selective coordination capabilities.