Overview
The Bussmann FRS-R-5 is a dual-element, time-delay fuse from the Fusetron family, engineered for industrial circuit protection. Rated for 5 amperes at 600 VAC (300 VDC), this Class RK5 fuse delivers current-limiting protection with a 10-second response time at 500% overload. Each fuse features ferrule-end connections and an interrupting rating of 200 kA at 600 VAC and 20 kA at 300 VDC, making it suitable for motor circuits, transformers, and general distribution equipment.
Key Features
- Class RK5 dual-element, current-limiting design for selective circuit protection
- Time-delay (slow-blow) response minimizes nuisance tripping on startup inrush
- Ferrule-end construction with 0.81″ diameter and 5″ overall length
- 200 kA interrupting rating at 600 VAC; 20 kA at 300 VDC
- UL, CSA, and CE certifications for North American and international compliance
- Non-indicating (sealed) design—no external fuse-blown indicator
Technical Specifications
- Current Rating: 5 A
- Voltage Rating: 600 VAC / 300 VDC
- Fuse Class: Class RK5 (Dual-Element, Time-Delay)
- Interrupting Rating: 200 kA @ 600 VAC, 20 kA @ 300 VDC
- Blow Characteristic: Time-Delay (10 seconds @ 500% current)
- Physical Dimensions: 0.81″ diameter × 5″ length (20.57 mm × 127 mm)
- Fuse Size (Metric): 20.6 mm × 127 mm
- Connection Type: Ferrule End × Ferrule End
- Weight: 0.13 lb per fuse
- Certifications: UL, CSA, CE
- Series: Bussmann Fusetron FRS-R
- Manufacturer: Eaton (Bussmann Division)
Typical Applications
The FRS-R-5 is commonly used in:
- Motor starter circuits and motor control centers (MCCs)
- Power distribution panels and switchboards
- Transformer primary and secondary circuits
- Industrial machinery and equipment branch circuits
- HVAC and pump motor protection
- Feeder and branch circuit protection where selective coordination is required
Compatibility & Replacements
Compatible With
- Standard Class R fuse blocks and clips rated for 600V
- Industrial control panels and electrical enclosures
- Motor starters and contactor assemblies
- Transformer secondary circuits up to 600V
- Any circuit or equipment designed for Class RK5 fuses at 5A, 600V
Replaces / Drop-In Replacement For
- Littelfuse FLSR-5 (5A Class RK5)
- Mersen TRS-R-5 (equivalent current-limiting fuse)
- Other OEM-equivalent Fusetron FRS-R-5 models from prior manufacturing
Works With
- Industrial control systems and PLCs requiring fused branch circuits
- Motor control centers (MCCs) with RK5-class fuse blocks
- Standard electrical distribution equipment operating at 600V nominal
- Single-phase and three-phase industrial systems
- UL 508A and UL 61439 compliant switchgear and control panels
