Overview
The Mersen A480R6R-1HE is a high-performance medium-voltage fuse engineered for motor protection in industrial electrical systems. This R-rated, back-up current-limiting fuse is part of Mersen’s Amp-Trap® product line and provides dependable overcurrent and short-circuit protection for medium-voltage motor circuits and motor controllers. The unit combines compact ferrule-mount design with proven arc-limiting technology, making it a drop-in replacement for standard 1-barrel fuse clips.
Key Features
- Current-limiting technology reduces let-through fault current and minimizes equipment damage during faults
- R-Rated classification engineered for back-up motor protection when coordinated with overload relays
- Blown-fuse visual indicator provides positive confirmation of fuse operation
- Ferrule terminal with clip mounting for standard medium-voltage fuse holders
- Silver-plated copper contacts ensure reliable electrical connection
- Single-barrel, epoxy-encased construction rated for 4800 VAC continuous operation
Technical Specifications
- Amp Rating: 170 A at 40°C
- Voltage Rating: 4800 VAC
- Interrupting Rating: 65 kA RMS symmetrical
- Class: R (Back-Up)
- Size Designation: 6R
- Mounting: Ferrule / Clip
- Body Diameter: 3 inches
- Body Length: 15.97 inches
- Clip Center Spacing: 12.5 inches
- Contact Material: Silver-plated copper
- Indicator: Blown-fuse visual indicator (1 lb tripped force)
- UL Component Recognized: Yes
Typical Applications
- Medium-voltage motor short-circuit protection in 4600–4800 VAC systems
- Back-up protection for motor starters and controllers in industrial facilities
- Pump, fan, and compressor drive circuits requiring coordinated overload and fault protection
- Utility and commercial power distribution systems with motor loads
- Equipment requiring fast fault isolation and arc containment
Compatibility & Replacements
Compatible With
- Standard medium-voltage ferrule-mount fuse clips (12.5 in center spacing)
- Motor starter and soft-start controllers rated for 4800 VAC
- Power distribution systems with medium-voltage bus configurations
- Overload relay coordination in NEMA and IEC-rated motor starters
Replaces / Drop-In Replacement For
- Mersen A480R6R-1 (without HE visual indicator)
- Ferraz Shawmut A480R6R-1 (legacy Ferraz designation)
- Other 6R, 4800V ferrule-mount fuses with compatible clip geometry
Works With
- Siemens, ABB, General Electric, Rockwell Automation, Schneider Electric motor starter systems
- Medium-voltage motor protection schemes following UL 248, IEC 60282 standards
- Coordination software and selectivity studies for industrial power systems
