Mersen Amp-Trap 2000 AJT Class...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$57.50
Mersen Amp-Trap 2000 AJT Class J Time-Delay Fuse, Ferrule Terminal

Mersen Amp-Trap 2000 AJT Class J Time-Delay Fuse, Ferrule Terminal

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Model: AJT8N

In Stock (leaves warehouse same day if ordered before 3pm ET)

$57.50
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Mersen Amp-Trap 2000 AJT Class J Time-Delay Fuse, Ferrule Terminal

The Mersen AJT is a Class J time-delay fuse from the Amp-Trap 2000 series, built for reliable branch-circuit and equipment overcurrent protection. Rated 600VAC/500VDC with a 200 kA AC max breaking capacity, this ferrule-terminal, clip-mounted fuse is engineered for demanding electrical protection applications across both AC and DC systems. Tin-plated copper connection terminals and a GMG insulating body support dependable performance across 50/60 Hz systems, with individual amperage ratings available across the AJT line (e.g. 7A).

Key Features

  • Time-Delay Characteristic: Class J time-delay design allows momentary inrush current while protecting against sustained overloads.
  • Dual Voltage Rating: Rated 600VAC and 500VDC for use across both AC and DC electrical systems.
  • High Interrupting Capacity: 200 kA AC max I'r breaking capacity for protection in high fault-current environments.
  • Terminal Construction: Tin-plated copper connection terminals in a ferrule configuration for secure, low-resistance connections.
  • Clip Mounting: Designed for clip-style mounting for straightforward installation and replacement.
  • Insulating Body: GMG body insulating material supports durable fuse construction.
  • Frequency Compatibility: Rated for 50/60 Hz electrical systems.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Branch Circuit Overcurrent Protection
  • Industrial Control Panels and Equipment
  • Motor and Transformer Circuit Protection
  • AC and DC Electrical Distribution Systems
  • Panelboard and Switchgear Fuse Replacement

Why Mersen?

Mersen's Amp-Trap 2000 Class J fuses combine a durable GMG insulating body with tin-plated copper terminals for consistent, low-resistance connections. With a 200 kA interrupting rating and RoHS-compliant construction, the AJT series is engineered for dependable, code-conscious overcurrent protection in professional electrical installations, with a range of amperage ratings available to match branch-circuit and equipment protection requirements.

Manufacturer Resources

Product Specs

Product Type:
Fuse
Amperage Rating:
7A
Voltage Rating:
600VAC/500VDC
Series:
Amp-Trap 2000
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Wiring Devices

Mersen AJT8N – Frequently Asked Questions

1) Will a Mersen AJT Class J fuse drop into my existing Class J fuse block?
Yes, if the block is Class J and sized for the same amp range. The AJT uses ferrule terminals and clip mounting, which is the standard Class J ferrule construction on the smaller amp ratings. Class J blocks are dimensionally rejecting on purpose, so an AJT will not seat in a Class R, Class T, or midget block, and a Class J block will not accept those either. Match the block's amp band (0-30, 31-60, and so on) to the fuse you order.
2) Can I use the Mersen AJT on a DC circuit, like a solar combiner or a DC drive?
The AJT carries a dual rating, 600VAC and 500VDC, so it is usable on DC systems up to 500 volts as well as 600 volt AC branch circuits. On the AC side it is rated for 50/60 Hz. That dual rating is the reason it turns up in DC distribution work where a plain AC-only fuse would not be acceptable.
3) Will a time-delay Class J fuse hold on motor starting inrush without nuisance blowing?
That is what the time-delay characteristic in the AJT is for. It passes momentary inrush, the kind a motor or transformer draws on energizing, while still clearing sustained overloads. A fast-acting Class J in the same amp rating will open on that same inrush. If you are protecting semiconductors or a purely resistive load with no startup surge, the time-delay curve is not what you want.
4) Is 200kA interrupting enough for my service with a high available fault current?
The AJT is rated 200 kA AC maximum breaking capacity, which is the top interrupting tier commonly specified and covers essentially any available fault current you will see downstream of a commercial or industrial service. Panel and control-panel short-circuit current ratings are frequently built around exactly this number.
5) Can I replace a Class R or a plain 600V cartridge fuse with a Class J AJT?
Not directly. Class J bodies are physically shorter and smaller in diameter than Class R and Class H/K cartridges of the same amp rating, so an AJT will not seat in those clips and swapping classes changes the let-through energy the downstream equipment was evaluated against. Changing to Class J means changing the fuse block or holder to a Class J one. Where the equipment nameplate calls out Class J, the AJT is the correct class to buy.
6) Can a Square D PowerLogic energy meter fuse pack be used in place of a Mersen AJT Class J fuse?
No. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended to protect the voltage-sensing leads of an energy meter, not the circuit itself. The Mersen AJT is a Class J time-delay fuse rated 600VAC/500VDC with a 200 kA AC breaking capacity, sold in amperage ratings from 3A through 200A for branch-circuit and equipment overcurrent protection. The two share a 600V class but do entirely different jobs: the AJT carries and clears load current in a Class J clip-mounted fuse block, while the PowerLogic pack sits on metering instrument leads at half an amp. Substituting one for the other leaves either the meter or the branch circuit unprotected.
7) What amp ratings does the Mersen AJT ferrule fuse come in?
The AJT ferrule-terminal range runs 3A, 3.5A, 4A, 5A, 6A, 7A, 8A, 20A, 25A, 30A, 35A, 50A, 60A, and 200A. Part numbers follow the amp value directly, so a 30 amp is AJT30N and a 7 amp is AJT7N. The fractional rating is written AJT3-1/2N.
8) What does the N suffix on AJT30N mean, and do I need to specify anything else when ordering?
Amperage is the only thing you pick. The N designates the ferrule-terminal, clip-mounted construction rather than a bolt-on blade version, so AJT30N is the 30 amp ferrule fuse. Voltage, interrupting rating, and the time-delay curve are the same across every amp rating in the range, so there is no separate voltage or speed option to call out.
9) I need small control-circuit fuses under an amp, not a branch fuse. Is the AJT the right part?
No. The AJT ferrule range starts at 3A, so anything below that is outside it. For a metering or instrument circuit, the Square D PowerLogic energy meter fuse pack is a 0.5A 600V set of three sold for that purpose. Use the AJT for branch circuits, control panels, motor and transformer protection, not for sub-amp metering taps.
10) Do I need a different fuse block for the 200 amp AJT than for the 30 amp?
Yes. Class J holders are built in amp bands, and a 200 amp fuse is a different physical size entirely from a 30 amp, so it needs a holder rated for that band. Order the block to the fuse's ampere rating, not just to the class. At the larger ratings the connection style changes as well, so confirm the block matches the terminal on the fuse you are buying.
11) Is the Mersen AJT RoHS compliant for a spec that requires it?
Yes, the AJT is RoHS compliant. The fuse body is a GMG insulating material and the connection terminals are tin-plated copper, which is also what keeps contact resistance low in the clips over repeated replacement.
How fast can I get the Mersen AJT8N delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Mersen AJT8N come with a warranty?
Absolutely. The Mersen AJT8N is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Mersen AJT8N?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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