Bussmann Time Delay Fuse FRS-R Series 125A 600VAC/300VDC Class RK5 Dual Element Blade End

Bussmann Time Delay Fuse FRS-R Series 125A 600VAC/300VDC Class RK5 Dual Element Blade End

Professional-Grade Electrical Protection for Motor and Transformer Circuits

The Bussmann Time Delay Fuse FRS-R Series 125A delivers superior electrical protection and circuit safety for motor starting circuits 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

• Dual Element Design - Provides time delay for motor starting while offering fast short circuit protection
• 200 kAIC Interrupt Rating at 600VAC - Handles high fault currents safely in industrial electrical systems
• 10 Second Time Delay at 500% - Allows motor starting surges while protecting against sustained overloads
• Current Limiting Technology - Reduces let-through energy and protects downstream equipment from damage

Safety & Standards Compliance

• Class RK5 Classification - Meets NEC requirements for motor protection and selective coordination
• CE Marked Certification - Ensures compliance with international electrical safety standards
• Non-Indicating Design - Provides reliable protection without visual indication for standard applications

Technical Specifications

125 ampere rating, 600VAC/300VDC voltage rating, 200 kAIC interrupt rating at 600VAC, Class RK5 current limiting fuse, blade end x blade end connection, dual element construction, 10 second time delay at 500% rated current, dimensions 5 inches length x 0.81 inches width x 0.81 inches height, weight 0.4 pounds, non-indicating operation.

Installation & Setup

1. Turn off power and verify zero energy state using proper lockout/tagout procedures
2. Remove existing fuse using appropriate fuse pullers and safety equipment
3. Inspect fuse holder contacts for corrosion, damage, or loose connections
4. Insert new Bussmann FRS-R fuse ensuring proper blade end alignment and full insertion
5. Verify secure connection and proper fuse holder engagement
6. Restore power and test circuit operation following NEC guidelines

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery
• Transformer Protection - Distribution transformers, control transformers, and power supply circuits
• Industrial Control Panels - Motor control centers, variable frequency drives, and automation systems
• Commercial Buildings - Elevator motors, escalator drives, and building automation equipment
• Power Distribution Systems - Switchgear, panelboards, and electrical distribution equipment
• Lighting Circuits - High-intensity discharge lighting and large lighting contactors
• Welding Equipment - Industrial welding machines and plasma cutting systems
• Process Equipment - Manufacturing machinery, material handling systems, and production lines

Dual Element Current Limiting Advantage

Bussmann dual element technology provides superior motor protection by combining time delay characteristics for starting surges with fast-acting short circuit protection. The current limiting design reduces arc energy and protects electrical equipment from damage during fault conditions, while selective coordination ensures only the affected circuit opens during overload conditions.

Why Choose Bussmann Quality?

Bussmann commitment to electrical safety includes rigorous testing for NEC compliance, reliable overcurrent protection performance, and professional-grade construction for demanding electrical installations. Every FRS-R series fuse delivers consistent protection characteristics, ensuring electrical contractors and facility managers can depend on superior circuit protection and electrical system reliability.