Bussmann Time Delay Fuse FRS-R Series 40A 600VAC/250VDC Class RK5 Dual Element Ferrule End

Bussmann Time Delay Fuse FRS-R Series 40A 600VAC/250VDC 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 with 10-second time delay at 500% rated current, 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 temporary overloads
• 10 Second Time Delay at 500% - Allows safe motor starting while protecting against sustained overloads
• 40A Current Rating - Handles substantial electrical loads with reliable overcurrent protection
• 600VAC/250VDC Voltage Rating - Versatile protection for AC and DC electrical systems

Safety & Standards Compliance

• Class RK5 Current Limiting - Reduces available fault current to protect downstream equipment and personnel
• 200 kAIC Interrupt Rating at 600V - Safely clears high fault currents in industrial electrical systems
• CE Marked Compliance - Meets international electrical safety standards for professional installations

Technical Specifications

Current Rating: 40 amperes | Voltage Rating: 600VAC/250VDC | Interrupt Rating: 200 kAIC at 600VAC, 20 kAIC at 250VDC | Fuse Class: RK5 current limiting | Element Type: Dual element time delay | Response Time: 10 seconds at 500% rated current | Connection: Ferrule end terminals | Dimensions: 2.34" H x 2.34" W x 11.63" L | Weight: 2.25 lbs | Indicator: Non-indicating design

Installation & Setup

1. Verify electrical system is de-energized and follow NFPA 70E safety procedures before installation
2. Confirm fuse holder compatibility with Class RK5 ferrule end fuse dimensions and ratings
3. Install fuse with proper orientation ensuring secure ferrule end connections in fuse clips
4. Verify amperage rating matches circuit protection requirements and conductor ampacity
5. Test installation with appropriate electrical testing equipment before energizing circuit
6. Document installation per NEC requirements and facility electrical maintenance procedures

Professional Applications

Ideal for:

• Motor Protection Circuits - HVAC motors, pump motors, conveyor systems, and industrial machinery with starting current 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 - Panelboards, switchboards, and electrical distribution equipment protection
• HVAC Equipment Protection - Air handling units, chillers, boilers, and building automation systems
• Manufacturing Equipment - Production machinery, process equipment, and industrial automation systems
• Electrical Panel Applications - Main breaker panels, sub-panels, and electrical service entrance protection

Dual Element Time Delay Advantage

Bussmann dual element technology provides superior selective coordination with upstream and downstream protective devices. The time delay element handles temporary overloads and motor starting currents while the current limiting element provides fast fault current interruption, ensuring optimal electrical system protection and minimizing nuisance tripping in motor and inductive load applications.

Why Choose Bussmann Quality?

Bussmann demonstrates unwavering commitment to electrical safety through rigorous testing, international compliance standards, and reliable overcurrent protection technology. Every FRS-R series fuse delivers consistent performance in professional electrical installations, providing electrical contractors and facility managers with the trusted protection and NEC compliance required for safe, code-compliant electrical systems.