Overview
The Bussmann FRN-R-60 Fusetron is an energy-efficient dual-element, time-delay Class RK5 fuse rated 60 amperes at 250 Vac and 125 Vdc. It delivers both motor overload protection and current-limiting short-circuit protection in a single ferrule-terminal cartridge. The FRN-R-60 is designed for use in motor feeders, branch circuits, and equipment where selective coordination and reduced energy costs are priorities.
Key Features
- Dual-element construction: Provides separate overload and short-circuit protection paths
- Time-delay operation: Withstands 500% rated current for minimum 10 seconds, allowing motor inrush currents to pass safely
- Current-limiting design: Opens in as little as 0.004 second during short-circuit conditions, reducing peak fault current and arc damage
- Class RK5 rejection: Fits standard Class H, K, or R fuse blocks with notch-and-groove design
- UL Listed: Meets UL 248-12 and CSA standards for reliable, code-compliant protection
- Energy efficient: Minimizes nuisance outages and improves power system efficiency in three-phase applications
Technical Specifications
| Amperage Rating | 60 A |
| Voltage Rating | 250 Vac / 125 Vdc |
| Interrupting Rating | 200 kA (symmetrical) at 250 Vac; 20 kA at 125 Vdc |
| Fuse Class | RK5 (Class R) |
| Type | Dual-element, time-delay cartridge |
| Time-Delay Response | 10 seconds minimum at 500% rated current |
| Body Material | Ceramic with fiberglass layers |
| Terminal Type | Ferrule (clip-on / screw-in block mount) |
| Diameter | 0.81 inch |
| Length | 3 inches |
| Approvals | UL 248-12, CSA, CE |
| Series | Bussmann Fusetron FRN-R |
| Catalog Number | FRN-R-60 (non-indicating model) |
Typical Applications
- Motor feeder and branch circuit protection
- Industrial machinery and HVAC systems requiring selective coordination
- Single-phase and three-phase motor circuits
- Pump and compressor protection circuits
- Commercial electrical panels and disconnect switches
- Heavy-duty applications where nuisance outages must be minimized
Compatibility & Replacements
Compatible With
- Class H fuse blocks (with fuse reducer)
- Class K fuse blocks (with fuse reducer)
- Class R fuse blocks and holders (recommended)
- Motor control circuits and thermal overload relays
- Disconnect switches rated for Class R fuses
Replaces / Drop-In Replacement For
The FRN-R-60 directly replaces other Bussmann Fusetron FRN-R-60 units. Verify compatibility with your fuse block or disconnect switch before ordering, as Class R fuses require properly rated Class R equipment for safe operation. Consult your system integrator or electrical contractor if uncertain about replacement compatibility.
Works With
- Standard motor starter and contactor circuits
- Industrial control systems and PLCs
- Fuse block reducers (specify Class for conversion from H or K)
- Selective coordination schemes in multi-level power distribution
- Compatible with both ferrule and knife-blade fuse applications (ferrule terminal only)
