Overview
The Bussmann Fusetron FRS-R-80 is a Class RK5 dual-element, time-delay power fuse engineered for overcurrent protection in motor control, industrial power distribution, and commercial electrical systems. Its dual-element construction and time-delay characteristic make it ideal for circuits with inductive loads such as motors, transformers, and soft-starters where temporary surge currents are common.
Key Features
- Dual-Element Time-Delay Design: 10-second minimum delay at 500% rated current allows temporary inrush currents while protecting against sustained overloads and faults
- Current-Limiting Technology: Provides motor overload, ground fault and short circuit protection
- Class RK5 Rated: Dual-element, time-delay construction provides energy efficient advanced protection
- High Interrupting Capacity: 200 Kiloampere (Symmetrical, AC) interrupting rating
- Renewable Design: Blade-end cartridge body rated for both AC and DC applications
Technical Specifications
- Allows precise fuse sizing closer to actual full-load amperage while maintaining short-circuit protection for downstream equipment
- Voltage: 600 VAC/300 VDC; Current: 80 Ampere; Interrupting: 200 Kiloampere (AC), 20 Kiloampere (DC)
- Terminal: Blade terminal; Diameter: 1.11 inch; Length: 7.88 inch
- Certifications: UL 248-12, CSA C22.2, CE marked
Typical Applications
- Motor branch circuit protection (NEMA/NEC compliant)
- Transformer primary and secondary circuits
- Industrial control panel power distribution
- HVAC compressor and pump motor circuits
- Machine tool and automation equipment main feeders
- Battery charging circuits requiring DC protection
Compatibility & Replacements
Compatible With
- Class RK5 fuse holders and cartridge blocks rated for 600V
- Motor control centers (MCCs) with RK5 rejection slots
- Industrial switchboards and distribution panelboards
- Motor starters and soft-start equipment
- DC circuits up to 300VDC
Replaces / Drop-In Replacement For
- FRS-R80, FRS-R 80 Amp, FRS-R 80A, FRS-R80A, FRS-R-80A, FRSR80, FRSR-80, FRSR 80A, FRSR-80A (all manufacturer naming variants)
- Cooper Bussmann FRS-R-80 units
- Eaton Bussmann FRS-R-80 units
Works With
- UL Class RK5 rejection fuse holders
- Standard 600VAC electrical switchgear and panelboards
- Three-phase and single-phase motor circuits
- AC and DC power distribution systems
- Industrial automation and control systems
