Overview
The Eaton Bussmann FRS-R-1 is a Class RK5 Fusetron dual-element, time-delay fuse delivering 1A protection at 600Vac/300Vdc. Built with separate overload and short-circuit elements, this current-limiting fuse is engineered for equipment requiring selective coordination and transient immunity. The 200 kA interrupting rating at 600 Vac ensures reliable short-circuit protection while minimizing nuisance trips on motor inrush currents.
Key Features
- Dual-element, time-delay construction for 10-second minimum delay at 500% rated current (8 seconds for 1/10–30A sizes)
- 200 kA interrupting rating at 600 Vac; 20 kA at 300 Vdc
- Current-limiting design reduces let-through current and equipment damage during fault conditions
- Non-indicating (sealed) design for reliable operation
- 2:1 selective coordination ratio within the Bussmann RK5 family prevents upstream fuse openings
- UL Listed per UL Standard 248.12 for Class RK5 fuses
Technical Specifications
- Current Rating: 1 A
- Voltage Rating: 600 Vac / 300 Vdc
- Fuse Class: RK5 (UL Class R Branch Circuit Rated)
- Interrupting Rating: 200 kA at 600 Vac RMS Symmetrical; 20 kA at 300 Vdc
- Element Type: Dual-element, current limiting
- Time-Delay Characteristic: 10 seconds minimum at 500% rated current
- Case Size: Ferraz Shawmut A-Size (1/10–30A ratings)
- Indication: Non-indicating (sealed)
- Agency Approvals: UL Listed (UL Standard 248.12), CSA Certified (CSA C22.2 No. 248.12)
Typical Applications
- Motor circuits requiring overload and short-circuit protection
- Industrial control panels and equipment requiring selective coordination
- HVAC and refrigeration systems sensitive to nuisance trips
- Machine tool circuits and test equipment
- Facilities requiring UL Class RK5 fuse compliance (hospitals, data centers, commercial buildings)
Compatibility & Replacements
Compatible With
- Ferraz Shawmut Class R fuse clips and holders rated for 600 Vac
- Class R fuse reducers (for downsizing larger fuse blocks to 1A capacity)
- Bussmann/Eaton RM60 series fuse blocks (1-Pole, 2-Pole, 3-Pole configurations)
- Any equipment designed for UL Class RK5 branch circuit fuses
Replaces / Drop-In Replacement For
- Ferraz Shawmut Limitron Class RK5 fuses in same rating
- Littelfuse/FLNR-1 equivalent Class RK5 fuses
- Cooper Bussmann FRS-R-1 (original designation)
- Verify exact replacement compatibility with system documentation before ordering.
Works With
- Eaton/Bussmann Class RK5 fuse family (selectable coordination across 0.1–600A ratings)
- Standard 600 Vac industrial control systems
- Motor control centers (MCCs) and distribution panels
- Standard ferrous and non-ferrous fuse clips per UL 248
