Mersen Amp-Trap 2000® AJT Fuses 

May 29, 2026

Amp-Trap 2000® AJT fuses provide non-indication as well as a SmartSpot visual open fuse indicator. With advanced material technology the AJT fuse provides IEC Type 2 No Damage protection to main, feeder, and branch circuits, for all types of loads — yet, they require only half the mounting space needed for 600VAC Class RK fuses. AJT’s time-delay characteristics are ideal for handling typical motor and transformer inrush currents, while also providing superior current-limiting ability.

Features

  • Non-indicating or solid state SmartSpot visual blown fuse indicator
  • Time-delay for motor starting and transformer inrush
  • Self Certified 700VAC, 15-600A range, 100kA IR
  • 300kA interrupting rating – self-certified, UL witnessed tests
  • Extremely current-limiting for low peak let-thru current
  • Most current-limiting UL class fuse
  • Recommended for Arc Flash energy reduction
  • Small footprint requires less mounting space and allows smaller, more economical fuse blocks
  • Easy 2-to-1 selectivity for prevention of nuisance shutdowns
  • Unique Class J dimensions prevent replacement errors
  • High-visibility orange label gives instant brand recognition
  • Metal-embossed date and catalog number for traceability and lasting identification
  • Fiberglass body provides dimensional stability in harsh industrial settings
  • High-grade silica filler ensures fast arc quenching
  • Optional EI indicator/switch mount for AJT70 to 600 open fuse indication

Applications

  • Motor circuits
  • Mains
  • Feeders
  • Branch circuits
  • Lighting, heating & general loads
  • Transformers
  • Control panels
  • Circuit breaker back-up
  • Bus duct
  • Load centers

Technical Specifications

Frequency (Hz)50/60 Hz
Amperage Range1 to 600 A
Fuse ClassClass J
Speed/CharacteristicTime Delay
UL Category CodeJDDZ
CSA File NumberClass 1422-02 Guide 012636_0
Reach CompliantYes
Max Operating Temp.80 °C
Max Storage Temp.80 °C
Min Storage Temp.-25 °C
Harmonized System853610
UL File NumberFile E2137
More Information

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