Overview
The Mersen A480R3R-1HE is a Class R, 3R-rated back-up current-limiting medium voltage fuse designed for short-circuit protection of medium voltage motors and motor controllers. Operating at 4800 VAC with a 100-amp rating and 65 kA interrupt capacity, this fuse provides dependable protection in industrial and commercial motor starter applications where coordinated overload relay protection is required.
Key Features
- Current-Limiting Technology: High interrupting rating fuses intended for the short circuit protection of medium voltage motors and motor controllers
- Back-Up Design: Back-up fuses that have a minimum interrupting rating and must be coordinated with overload relays in combination motor starters
- 3R Class Rating: 3-inch (size D) diameter barrel with ferrule terminals
- Visual Indicator: Hookeye-style visual indication of fuse operation for easy inspection
- Standardized Construction: Come with a 3 (size D) or 4 (size E) in diameter barrels with ferrules and are mounted in spring reinforced clips
- Compliance: Meets NETA and ANSI C37 specifications
Technical Specifications
- Nominal Voltage Rating: 4800 VAC
- Ampere Rating: 100 A (3R)
- Interrupt Rating: 65 kA @ 4.8 kV
- Class: R (Back-Up, Current-Limiting)
- Mounting Style: Ferrule, Hookeye terminals
- Barrel Diameter: 3 inches (Size D)
- Overall Length: 15.97 inches (403 mm)
- Weight: Approximately 10.48 lbs
- Series: A480R (Amp-Trap)
- Certifications: UL, NEMA, IEC
Typical Applications
- Short-circuit protection in medium voltage motor starters
- Backup protection coordinated with motor overload relays
- Industrial motor control circuits rated 4.8 kV
- Commercial HVAC and refrigeration motor systems
- Manufacturing equipment and production line motors
- Utility and power distribution motor feeder protection
Compatibility & Replacements
Compatible With
- Medium voltage motor starters and combination motor controllers
- Class R clip-lock and spring-reinforced fuse clips
- 4800 VAC motor feeder circuits and distribution systems
- NEMA-rated industrial control equipment
- Mersen/Ferraz Shawmut A480R series fuse holders
Replaces / Drop-In Replacement For
- Original Gould Shawmut A480R3R-1 units
- Earlier Ferraz Shawmut A480R3R-1 production batches
- Verify compatibility with your specific motor starter manufacturer before substitution
Works With
- Medium voltage motor protection relay coordination schemes
- Class R fuse elimination coordination (FRCC) applications
- ANSI C37.46 and C37.48 motor protection standards
- Utility-grade motor starter assemblies
- Industrial automation and motor control systems
