Overview
The Bussmann FRS-R-100 is a Class RK5, dual-element, time-delay cartridge fuse rated for 600VAC and 100A. Part of the Fusetron FRS-R series, this industrial-grade fuse combines current-limiting protection with selective time-delay characteristics, making it ideal for three-phase power distribution, branch circuit protection, and equipment feeders where short-circuit transients require reliable coordination with upstream devices.
Key Features
- Dual-Element Construction: Combines thermal and magnetic elements for accurate overload and short-circuit protection
- Time-Delay Capability: Delivers minimum 10 seconds delay at 500% rated current, reducing nuisance trips on inrush currents
- 200kA Interrupting Rating: At 600VAC, provides high breaking capacity for large industrial systems
- Class RK5 Certification: UL and CSA approved for Code compliance and selective coordination in multi-level protection schemes
- Energy-Efficient Protection: Current-limiting design minimizes fault energy and thermal stress on connected equipment
Technical Specifications
- Voltage Rating: 600VAC / 300VDC
- Current Rating: 100A
- Interrupting Rating: 200kA RMS Symmetrical @ 600VAC; 20kA @ 300VDC
- Fuse Class: RK5 (current-limiting, time-delay)
- Type: Dual-Element Cartridge (non-indicating)
- Time Delay: Minimum 10 seconds at 500% rated current
- Dimensions: 1.34 in. diameter × 7.88 in. length (26.99mm × 200.15mm)
- Weight: Approximately 0.8 lbs (10.88 oz)
- Standards: UL, CSA, CE approved
Typical Applications
The FRS-R-100 is widely used in:
- Three-phase industrial motor feeders and branch circuits
- Power distribution panels and switchgear
- Transformer secondary circuits and distribution transformers
- Manufacturing equipment and process control systems
- Commercial HVAC and large lighting circuits
- Any system requiring coordination between feeder and downstream circuit protection
Compatibility & Replacements
Compatible With
- Allen-Bradley and other 600VAC industrial control systems
- Siemens, Square D, Eaton panelboards and disconnects
- Standard cartridge fuse holders (Class RK5 size)
- Three-phase distribution and motor control equipment
- Legacy and modern industrial electrical systems requiring RK5 class fuses
Replaces / Drop-In Replacement For
- Cooper Bussmann FRS-R-100 (earlier branded version)
- Littelfuse FLS-R-100 (equivalent Class RK5, 100A 600V)
- Other FRS-R series 100A variants in compatible holder assemblies
Works With
- Class RK5 cartridge fuse holders and clips
- 600V three-phase panelboards and circuit protection schemes
- Selective coordination systems (time-delay allows upstream devices to clear faults first)
- Industrial control software and SCADA systems monitoring feeder protection
