Overview
The Bussmann FRS-R-100 is a Class RK5 time-delay fuse rated for 100A at 600VAC or 300VDC. This non-indicating fuse features a blade end x blade end connection, a high interrupting rating of 200 kA at 600V AC (20 kA at 300V DC), and a 10-second time-delay at 500% of rated current. Manufactured by Eaton Bussmann (formerly Cooper Bussmann), these fuses are engineered for reliable circuit protection in industrial, commercial, and utility applications where nuisance trips must be minimized.
Key Features
- Dual-element, time-delay construction — Delivers 10 seconds (minimum) of time-delay at 500% of rated current
- Current-limiting design — Reduces let-through energy and thermal stress on equipment
- Class RK5 rating — UL Class RK5 Fusetron product offering provides energy efficient advanced protection
- High interrupting capacity — 200kA at 600V AC ensures reliable protection under fault conditions
- Blade terminal connectors — Standard blade end x blade end configuration for easy installation
- CE, UL, and CSA certified — Compliant with North American and international electrical standards
Technical Specifications
- Current Rating: 100A
- Voltage Rating: 600VAC / 300VDC
- Fuse Class: RK5
- Speed: Time-Delay (slow-blow)
- Interrupting Rating: 200kA @ 600V AC, 20kA @ 300V DC
- Time-Delay Response: 10 seconds minimum @ 500% rated current
- Connection: Blade end x blade end
- Diameter: 1.11 inch (28.19mm)
- Length: 7.88 inches (200.15mm)
- Weight: 0.41 lbs per unit
- Certifications: UL, CSA, CE
- Series: FRS-R Fusetron
- Quantity Per Lot: 5 fuses
Typical Applications
The Bussmann FRS-R-100 is ideal for:
- Industrial branch circuit protection (motors, heaters, transformers)
- Commercial electrical distribution panels
- Machine tool and process equipment protection
- HVAC and refrigeration systems where startup inrush is common
- Utility and backup power systems
- Replacement in existing FRS-R or equivalent fuse holders
Compatibility & Replacements
Compatible With
- Standard blade-end fuse holders rated for Class RK5 fuses
- 600VAC electrical distribution systems (up to 300VDC)
- Industrial control panels and switchgear
- NEMA-compliant electrical enclosures
- Backup generator and UPS systems
Replaces / Drop-In Replacement For
- Bussmann FRS-R-100 (exact same part)
- Cooper Bussmann FRS-R-100
- Fusetron FRS-R-100
- Any Class RK5 fuse rated 100A, 600V (verify part number and cartridge dimensions)
Works With
- Class RK5 fuse cartridge holders and panels
- 600V distribution equipment and circuit protection systems
- Time-delay applications requiring 10-second minimum delay at 500% current
- Current-limiting fuse applications where arc-flash risk must be reduced
