Overview
The Bussmann FRN-R-100 is a Class RK5 dual-element, time-delay, current-limiting cartridge fuse rated at 100 amperes and 250Vac/125Vdc. This fuse features an interrupting rating of 200 kA at 250 Vac, making it suitable for circuits requiring selective coordination and overcurrent protection. The FRN-R-100 is ideal for applications where both motor overload tolerance and short-circuit protection are needed.
Key Features
- Dual-element, time-delay current limiting design tolerates temporary motor surge currents without nuisance blowing
- 10-second minimum time-delay response at 500% of rated amperage, allowing motors to start reliably
- 200 kA interrupting rating at 250 Vac provides high short-circuit protection
- UL Listed (Standard 248-12, Class RK-5) and CSA Certified
- Energy-efficient design reduces system stress and heat buildup
- 2:1 selective coordination ratio within the Fusetron RK5 family prevents upstream fuse nuisance opens
Technical Specifications
- Rating: 100 amperes
- Voltage: 250Vac / 125Vdc
- Fuse Class: RK5
- Type: Dual-element, time-delay, current-limiting
- Interrupting Rating: 200 kA @ 250 Vac
- Time-Delay Response: 10 seconds minimum at 500% rated current
- Dimensions: 1.06 inch diameter × 5.88 inch length
- Body Material: Fiberglass cartridge with blade terminals
- Certifications: UL 248-12 Class RK-5, CSA C22.2 No. 248.12
Typical Applications
These fuses are typically found in power panelboards, motor control centers, combination starters and machinery disconnects. The time-delay characteristic makes the FRN-R-100 particularly suited for:
- Three-phase motor protection circuits
- Industrial equipment with inductive loads (transformers, contactors)
- Branch circuits requiring selective coordination
- HVAC systems and machinery disconnects
- UPS and backup power distribution systems
Compatibility & Replacements
Compatible With
- Class RK5 fuse blocks and holders rated for 100A
- 250Vac/125Vdc control circuits and panelboards
- Standard blade-terminal fuse cartridge holders
- All UL-listed Class RK5 selective coordination schemes
Replaces / Drop-In Replacement For
- Older Fusetron FRN-R-100 cartridges in existing installations
- Generic Class RK5 100A time-delay fuses requiring 250Vac operation
- Verify compatibility with your specific fuse block or disconnect switch before ordering
Works With
- Eaton/Bussmann low-voltage motor control centers
- Class RK5 selective coordination fuse families (FRN-R and FRS-R series)
- Standard UL-listed panelboards and combination starters
- Industrial PLCs and automation systems requiring backup circuit protection
