Overview
The Gould Shawmut A480T1E is a current-limiting potential transformer (PT) fuse engineered for primary winding protection in medium-voltage AC systems. Rated at 1 ampere, 4.8kV, and 50kA interrupting capacity, this Class E fuse delivers reliable fault protection with minimal let-through energy. The cylindrical ferrule design mounts securely in standard clips, making it a straightforward drop-in replacement for legacy installations.
Key Features
- Current-limiting design reduces arcing and energy let-through during faults
- High 50kA interrupting rating handles transient overcurrents reliably
- Class E rating ensures compatibility with medium-voltage PT circuits
- Ferrule terminal mounting fits standard fuse clips without modification
- Small cylindrical body (13/16 in. diameter × 5-5/8 in. length) reduces footprint
- Non-indicating fuse design with proven long service life
Technical Specifications
- Voltage Rating: 4.8 kVAC
- Current Rating: 1 A
- Interrupting Rating: 50 kA
- Fuse Class: E
- Fuse Type: Current-Limiting Potential Transformer
- Terminal Style: Ferrule
- Body Material: Fiber tube with metal ferrules
- Mounting: Standard clips (no tools required)
- Body Diameter: 13/16 inch
- Body Length: 5-5/8 inches
- Indicator: Non-indicating
Typical Applications
PT fuses are widely deployed in utility and industrial switchgear, power distribution systems, and control circuits requiring potentials for meter coils, protective relays, and synchronism checks. The A480T1E is particularly suited for:
- Medium-voltage distribution substations (480V secondary systems)
- Industrial facility electrical protection
- Primary PT winding fault isolation
- Safety control circuits in motor starters and protection schemes
- Retrofit and replacement in existing clip-mounted fuse banks
Compatibility & Replacements
Compatible With
- Standard ferrule-clip fuse holders rated 4.8 kV or higher
- Medium-voltage potential transformer primaries
- Utility protection relays requiring PT sourced signals
- Industrial and commercial switchgear with Class E PT circuits
Replaces / Drop-In Replacement For
- Ferraz Shawmut A480T1E (direct equivalent)
- Mersen A480T1E (current brand name for Shawmut/Ferraz line)
- Legacy Gould PT fuses in 1A 4.8kV configuration
- Verify exact mounting and physical dimensions with original fuse before replacement
Works With
- Ferrule-terminal clip mounting assemblies
- Medium-voltage distribution equipment from major OEMs
- Control systems requiring PT-derived metering and protection signals
- Class E fuse-rated circuit designs
