Overview
The Bussmann FRN-R-80 is a Class RK5 Fusetron dual-element, time-delay, current-limiting fuse engineered for industrial motor control and power distribution applications. Rated at 80 A with an interrupting rating of 200 kA at 250 Vac, this cartridge-style fuse provides advanced protection in combination starters, motor control centers, machinery disconnects, and power panelboards. The dual-element construction enables 10 seconds (minimum) of time-delay at 500% of rated current, allowing nuisance-free operation during inrush conditions while maintaining instantaneous short-circuit protection.
Key Features
- Dual-element, time-delay construction for motor circuit protection
- Class RK5 current-limiting fuse with 200 kA interrupting rating at 250 Vac
- 10-second minimum time-delay at 500% rated current reduces nuisance outages
- Non-indicating, knife blade terminal design for standard fuse holders
- Rejection design prevents misapplication in unintended equipment
- UL-listed and CSA certified for North American applications
Technical Specifications
- Rated Current: 80 A
- Voltage Rating: 250 VAC / 125 VDC
- Class: RK5 (250V Class R fuse)
- Fuse Type: Dual-element, time-delay, non-indicating
- Interrupting Rating: 200 kA at 250 Vac RMS; 20 kA at 125 Vdc
- Time-Delay Response: 10 seconds minimum at 500% of rated current
- Body Material: Fiberglass cartridge
- Terminal Style: Knife blade
- Overall Dimensions: 1.06 in. diameter × 5.88 in. length
- Standards: UL Class RK5, CSA C22.2 No. 198
Typical Applications
The FRN-R-80 is ideal for:
- AC motor circuits and motor control centers requiring branch-circuit protection
- Combination starters and soft-start drives
- Machinery disconnect switches with integral protection
- Industrial power panelboards and distribution switchboards
- Equipment requiring 80A protection at 250VAC with current-limiting characteristics
Compatibility & Replacements
Compatible With
- Standard Class RK5 fuse holders and clips rated for 250V/125V operation
- Motor control circuits and NEMA starters designed for Class RK5 fuses
- Combination motor controllers and machinery disconnects
- Industrial power distribution systems requiring dual-element fuse protection
Replaces / Drop-In Replacement For
- Older Bussmann Fusetron FRN-R-80 units (direct replacement)
- Cooper Bussmann FRN-R-80 (same part, manufacturer rebrand)
- Non-indicating RK5 80A time-delay fuses of equivalent rating (verify rejection design match)
Works With
- Industrial motor starters and variable frequency drives (as branch-circuit protection)
- Standard fuse holders and rejection-type fuse clips
- Equipment rated for Class RK5 or Class R current-limiting fuse protection
