Overview
The Bussmann FRS-R-3/10 is a compact cartridge fuse designed for precise circuit protection in industrial, commercial, and residential applications. As a Fusetron Class RK5 time-delay fuse, it combines dual-element construction with current-limiting performance to protect sensitive equipment from overcurrent conditions while tolerating harmless inrush currents common in motor circuits and transformers.
Key Features
- Dual-element, time-delay design tolerates temporary inrush currents without nuisance blowing
- Class RK5 classification provides UL/CSA-certified performance and interchangeability
- 200kA interrupting capacity at 600V delivers high breaking performance
- Cartridge form factor with ferrule ends ensures secure mounting in standard holders
- Compact 0.81″ diameter fits standard industrial fuse blocks and switches
- Lot of 3 units—stock multiple circuits or maintain spares
Technical Specifications
- Current Rating: 0.3A (3/10A)
- Voltage Rating: 600VAC / 300VDC
- Interrupting Capacity: 200kA @ 600V
- Class: RK5 (Time Delay / Dual Element)
- Speed: Slow Blow (Time Delay)
- Body Diameter: 0.81 inches (20.57mm)
- Overall Length: 5 inches (127mm)
- Weight per Unit: ~0.14 lb
- Terminal Type: Ferrule end × Ferrule end
- Certifications: UL, CSA, CE
- Quantity: 3 pieces
Typical Applications
- Motor branch circuits and motor control centers
- Transformer primary protection in low-voltage distribution
- Industrial control panel and switchboard protection
- HVAC equipment and refrigeration circuits
- General-purpose low-voltage circuit protection (up to 600V)
- OEM equipment requiring standard Class RK5 fuses
Compatibility & Replacements
Compatible With
- Standard cartridge fuse holders rated for 0.81″ diameter ferrule-end fuses
- Bussmann, Littelfuse, and Mersen-compatible fuse blocks
- Industrial switchboards, disconnect switches, and panelboards
- Any system designed for UL Class RK5 branch-circuit fuses
- Motor control centers and branch-circuit protection applications
Replaces / Drop-In Replacement For
- Earlier Bussmann Fusetron FRS-R-3/10 units (legacy stock)
- Cooper Bussmann FRS-R-3/10 (pre-Eaton branding)
Works With
- Standard Class RK5 fuse applications per UL 248-12 and CSA C22.2 No. 248.12
- Industrial electrical systems rated 600VAC or lower
- Dual-element fuse-compatible motor starters and branch-circuit breakers
