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 Range	1 to 600 A
Fuse Class	Class J
Speed/Characteristic	Time Delay
UL Category Code	JDDZ
CSA File Number	Class 1422-02 Guide 012636_0
Reach Compliant	Yes
Max Operating Temp.	80 °C
Max Storage Temp.	80 °C
Min Storage Temp.	-25 °C
Harmonized System	853610
UL File Number	File E2137