Overview
The Ferraz Shawmut Amp-Trap2000 AJT250 is a Class J time-delay, current-limiting fuse engineered for reliable protection in industrial electrical systems. Rated 250 A at 600 VAC with 200 kA interrupt capacity, this dual-element fuse combines fast fault detection with inrush tolerance, making it ideal for circuits powering motors, transformers, rectifiers, and inverters. The AJT fuse requires only half the mounting space needed for 600VAC class RK fuses, offering a compact footprint for tight panel designs.
Key Features
- Time-delay characteristic handles typical motor and transformer inrush currents while providing superior current limiting ability
- SmartSpot visual open fuse indicator for quick blown-fuse detection
- IEC Type “2” (No Damage) protection to main, feeder, and branch circuits for all types of loads
- Compact Class J footprint with knife-blade ends that fit standard Class J holders and blocks
- High interrupt ratings: 600 V AC with 200 kA AC interrupt rating and 300 V DC with 100 kA DC capability
- UL and CSA certified for North American industrial applications
Technical Specifications
The AJT250 delivers consistent performance across a wide range of industrial environments and load profiles:
- Amperage Rating: 250 A
- Voltage Rating: 600 VAC / 500 VDC
- Class: J
- Time Delay: Yes (Dual Element)
- Interrupt Rating: 200 kA AC / 100 kA DC
- Body: Cylindrical, Fiberglass
- Terminals: Blade (knife-blade)
- Mounting: Clip Mount / Bolted
- Dimensions: 2.12″ Dia × 7.13″ L (53.85 mm × 181.1 mm)
- Weight: 2 lbs
- Certifications: UL, CSA, RoHS Compliant
- Frequency: 50/60 Hz
Typical Applications
Time-delay AJT fuses handle motor inrush currents without nuisance trips and provide current-limiting ability for excellent overcurrent protection. Common installations include:
- Motor circuits and motor control centers (MCC)
- Feeder and branch circuit protection
- Transformer primary/secondary protection
- Rectifier and UPS system input protection
- Power electronic equipment circuits
- Industrial machinery and conveyor systems
Compatibility & Replacements
Compatible With
- Class J fuse holders and blocks (blade terminal type)
- Standard industrial panel-mount fuse blocks
- Motor control centers (MCC) with Class J cartridge fuseholders
- Ferraz Shawmut AJT series fuse accessories and indicators
- North American 600V three-phase and single-phase systems
Replaces / Drop-In Replacement For
- Ferraz Shawmut AJT250 (direct replacement for current production)
- Legacy Gould Shawmut AJT250 units
- Mersen AJT250 (current manufacturer designation)
Works With
- Class J fuse cartridge systems (blade terminal)
- Industrial control systems (600 VAC, three-phase)
- Renewable energy systems (DC-rated models)
- Standard electrical distribution panels and equipment
- Equipment designed for 200 kA symmetrical fault current rating
