AJT - Class J - Time-delay
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.
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.
Product data sheets
- DS-AJT-Class-J-Time-Delay-Mersen
pdf - 269.3 KB
Brochures and Flyers
- BR-Amp-Trap-2000-Fuses-Brochure
pdf - 2.09 MB
- BR-Fuse-Control-Program-Brochure
pdf - 2.83 MB
Charts
- CHT-UL-Class-to-Part-Number-Quick-Reference
pdf - 175.45 KB
- CHT-Recommended-Fuses-and-Fuse-Holder-Chart
pdf - 273.61 KB
Product Applications
Compliance
- COM-CE-ROHS-Declaration_Class_Type_ J-20-0004
pdf - 216.13 KB
- UKCA 22-0004 Class Type J 20260511
pdf - 204.16 KB
Key features & benefits
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
| 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 |
| Max Operating Temp. | 80 °C |
| Max Storage Temp. | 80 °C |
| Min Storage Temp. | -25 °C |
| Harmonized System | 853610 |
| UL File Number | File E2137 |
Reference Finder
Scroll
| Item number | Ampere rating | Fuse size | Clearing I2t At Rated Voltage | Indication System | Product weight |
|---|---|---|---|---|---|
|
AJT1 See product
|
1A | - | - | No | 0.044kg |
|
AJT1-1/2 See product
|
1.5A | - | - | No | 0.044kg |
|
AJT1-1/4 See product
|
1.25A | - | - | No | 0.044kg |
|
AJT1-6/10 See product
|
1.6A | - | - | No | 0.044kg |
|
AJT1-8/10 See product
|
1.8A | - | - | No | 0.044kg |
|
AJT10 See product
|
10A | - | - | No | 0.044kg |
|
AJT100 See product
|
100A | - | - | No | 0.1093kg |
|
AJT100EI See product
|
100A | - | - | Yes | 0.1633kg |
|
AJT100ID See product
|
100A | - | - | Yes | 0.1093kg |
|
AJT10ID See product
|
10A | - | - | Yes | 0.044kg |
-
Important Notice
AJT Series Part Number Changes Effective July 6, 2026
Mersen is committed to continuously improving customer experience and simplifying product identification across our portfolio. As part of this effort, effective July 6, 2026, we will implement a revision to AJT Series fuse catalog numbers.
This update is intended to create greater consistency across product families, streamline ordering processes, and reduce complexity within distributor and customer ERP systems.
