Overview
The Bussmann FRS-R-45 is a Class RK5 Fusetron time-delay cartridge fuse engineered for critical overcurrent protection in industrial and commercial electrical systems. Operating at 45A and 600VAC (250VDC), this dual-element, current-limiting fuse combines fast response under fault conditions with built-in time delay to tolerate temporary inrush currents.
Key Features
- Dual-Element Design: Time-delay action allows 10 seconds response at 500% of rated load, preventing nuisance trips from motor inrush
- Class RK5 Rating: Current-limiting fuse with 200 kA interrupting rating at 600VAC and 20 kA at 250VDC
- Compact Cartridge Form: Ferrule-end construction, 1.06 inch diameter, 5.5 inch overall length
- Industry Approvals: UL 248-12, CSA C22.2, and CE certified
Technical Specifications
The FRS-R-45 meets strict industry standards for both AC and DC applications, providing consistent protection across diverse industrial equipment.
Typical Applications
- Motor control circuits and feeder protection
- Industrial machinery and factory equipment
- HVAC systems and large compressors
- Power distribution panels and switchgear
- Renewable energy and backup power systems
Compatibility & Replacements
Compatible With
- 600VAC industrial control systems and distribution equipment
- Eaton Bussmann cartridge fuse holders and blocks rated RK5
- Standard ferrule-end cartridge fuse mounting standards
- Motors and loads tolerating dual-element time-delay characteristics
Replaces / Drop-In Replacement For
- Cooper Bussmann FRS-R-45 (original OEM designation)
- Littelfuse FLS-R 45A fuse as a potential alternative (verify application compatibility with system integrator)
Works With
- Standard RK5 Class cartridge fuse holders and blocks
- 600V industrial AC distribution systems
- Motor protection and thermal overload relay schemes
