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