Overview
The Gould Shawmut A480R9R-1HE is a back-up current-limiting medium voltage fuse designed for short-circuit protection of motors and motor controllers. This R-rated fuse carries a dual voltage rating of 2400V/4800V and operates at both 50 and 60 Hz. The 9R designation indicates a 200A current rating, making it suitable for industrial and commercial motor protection applications where coordinated overload protection is required.
Key Features
- Current-limiting design reduces peak let-through current for superior equipment protection
- R-rated for back-up protection in conjunction with overload relays in motor starters
- 63 kA interrupt rating at 5.5 kV provides reliable short-circuit protection
- Dual voltage rated: 2400V and 4800V, 50/60 Hz operation
- Hookeye terminal construction with ferrule mounting for standard clips
- UL Recognized and meets ANSI C37.46 standards
Technical Specifications
The A480R9R-1HE maintains tight electrical characteristics and physical dimensions for interchangeability across medium voltage fuse applications:
- Voltage Rating: 2400V AC / 4800V AC
- Frequency: 50/60 Hz
- Current Rating: 200A (9R designation)
- Interrupting Rating: 63 kA @ 5.5 kV (symmetrical)
- Minimum Interrupting Capacity: 740A RMS
- Length: 403 mm (15.88 inches)
- Barrel Diameter: 3 inches (Size D)
- Terminal Type: Ferrule with hookeye
- Class: R-Rated Back-Up
- Manufacturing Standard: ANSI C37.46-1981
Typical Applications
The A480R9R-1HE is commonly used in:
- Large motor circuits requiring coordinated protection (5–10 HP range at 4800V)
- Motor starter and controller short-circuit backup protection
- Industrial distribution systems operating at medium voltage
- Utility and industrial power systems with dual-voltage switchgear
- OEM and retrofit motor control cabinets
Compatibility & Replacements
Compatible With
- Medium voltage motor starters with R-rated fuse clips
- Switchgear and distribution equipment rated 4800V, 3-phase
- Spring-reinforced standard fuse clips for Size D barrels
- Overload relays and motor protection relays (coordinated protection required)
Replaces / Drop-In Replacement For
- Ferraz Shawmut A480R9R-1 (non-hookeye version)
- Mersen A480R9R-1HE (current manufacturer designation)
- Gould A480R9R-1HE (legacy Gould brand)
Works With
- IEC 60269 medium voltage fuse standards
- ANSI C37.46-1981 R-rated fuse specifications
- UL-recognized motor protection circuits
- Allen-Bradley motor starters (coordinated protection designs)
- Siemens, ABB, and Schneider Electric switchgear systems
