Bussmann Time Delay Fuse FRS-R Series 25A 600VAC/300VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRS-R Series 25A 600VAC/300VDC Class RK5 Dual Element Ferrule End

Professional-Grade Dual Element Time Delay Protection

The Bussmann Time Delay Fuse FRS-R Series delivers superior electrical protection and circuit safety for motor circuits and inductive loads. This Class RK5 time delay fuse features dual element construction 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 Construction - Provides superior time delay characteristics for motor starting currents and inductive load protection
• 10 Second Time Delay at 500% - Allows temporary overloads while protecting against sustained overcurrent conditions
• Class RK5 Current Limiting - Reduces let-through energy and protects downstream equipment from fault damage
• 200 kAIC Interrupt Rating at 600V - Handles high fault currents safely in industrial and commercial electrical systems

Safety & Standards Compliance

• UL Listed Design - Meets rigorous safety standards for electrical protection applications
• NEC Compliant Installation - Ensures code compliance for professional electrical installations
• CE Marked Certification - International safety approval for global electrical applications

Technical Specifications

25 ampere rating, 600VAC/300VDC voltage rating, 200 kAIC interrupt rating at 600V, 20 kAIC at 300VDC, Class RK5 current limiting, ferrule end connections, dual element time delay construction, 10 second response time at 500% rated current, dimensions 2.34" x 2.34" x 11.63", weight 2.25 lbs, non-indicating design for standard electrical panel installations.

Installation & Setup

1. Verify power is OFF and use proper lockout/tagout procedures before fuse installation
2. Confirm fuse amperage rating matches circuit protection requirements and conductor ampacity
3. Insert ferrule ends fully into fuse clips ensuring secure mechanical and electrical connection
4. Verify proper fuse orientation and that voltage rating meets or exceeds system voltage
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document fuse installation per NEC requirements and facility maintenance procedures

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery with starting surge requirements
• Transformer Primary Protection - Distribution transformers, control transformers, and power supply protection circuits
• Industrial Control Panels - Motor control centers, variable frequency drives, and automated equipment protection
• Commercial Lighting Circuits - High-intensity discharge lighting, LED drivers, and ballast protection applications
• Power Distribution Systems - Electrical panels, switchgear, and distribution equipment overcurrent protection
• HVAC Equipment Protection - Air handling units, chillers, boilers, and building automation system circuits
• Manufacturing Equipment - Production machinery, assembly lines, and process control system protection
• Electrical Service Panels - Commercial buildings, industrial facilities, and institutional electrical installations

Dual Element Time Delay Advantage

Bussmann dual element technology provides superior selective coordination and motor protection by combining fast-acting short circuit protection with time delay overload protection. The thermal element handles temporary overloads while the fusible element provides instantaneous short circuit protection, ensuring optimal circuit protection and equipment longevity in demanding electrical applications.

Why Choose Bussmann Quality?

Bussmann commitment to UL listing, NEC compliance, and reliable overcurrent protection makes this time delay fuse the preferred choice for electrical contractors and facility managers. With proven current limiting technology, superior arc suppression, and consistent performance in industrial environments, Bussmann fuses deliver the electrical safety and protection reliability that professional installations demand.