Overview
The Gould Shawmut A480R9R-1HE is a back-up R-rated medium voltage fuse designed for short-circuit protection of medium voltage motors and motor controllers. This fuse combines current-limiting technology with a high interrupting rating, making it essential for coordinated motor starter protection in industrial power distribution systems.
Key Features
- Back-Up R-Rated Design: Current-limiting fuse with minimum interrupting rating for motor protection circuits
- Ferrule Mount with Hookeye: Hookeye visual indicator for easy identification and clip mounting
- Epoxy Insulation: Durable epoxy body with silver-plated copper terminals for reliable electrical contact
- Fast-Acting Characteristic: Rapid response to short-circuit faults with coordinated overload relay backup
- UL Listed: Certified for North American electrical installations
Technical Specifications
The Gould Shawmut A480R9R-1HE fuse meets the following electrical and physical parameters:
- Current Rating: 9R (200 amperes)
- Voltage Rating: 4800V AC (maximum)
- Frequency: 50/60 Hz
- Interrupting Capacity (AC): 50 kA @ 4800V
- Barrel Diameter: Size D or Size E (approximately 410 mm length for -1HE variant)
- Mounting Style: Ferrule type with spring-reinforced clips
- Terminal Material: Silver-plated copper
- Body Material: Epoxy
- Indication System: Visual indicator (Hookeye)
- Speed Class: R-Rated (back-up fuse)
Typical Applications
The A480R9R-1HE fuse is widely used in:
- Medium voltage motor protection circuits (3-5 kV class)
- Motor starter backup protection with coordinated overload relays
- Industrial power distribution systems requiring high interrupting capacity
- OEM motor control equipment and switchgear assemblies
- Mining, pulp & paper, and utility power systems
Compatibility & Replacements
Compatible With
- Medium voltage motor starters (coordinated with overload relays)
- Siemens SIRIUS medium voltage motor starters
- ABB motor control centers
- Square D/Schneider Electric medium voltage equipment
- Medium voltage switchgear and fuse clip assemblies rated for R-Rated fuses
- Spring-reinforced ferrule-mount fuse holders (Clip style)
Replaces / Drop-In Replacement For
- Ferraz Shawmut A480R9R-1HE
- Mersen A480R9R-1HE (post-acquisition designation)
- Ferraz A480R9R-1HE
- Shawmut A480R9R-1 (non-hookeye variant, verify terminal compatibility)
Works With
- Industrial motor control systems using medium voltage protection
- Power distribution equipment requiring UL-listed R-Rated fuses
- ANSI C37.46 medium voltage motor protection standards
- IEC-equivalent medium voltage motor protection circuits
- Coordinated motor starter packages with thermal overload relays
