Mersen Amp-Trap A6Y Type 1 Fer...
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Mersen Amp-Trap A6Y Type 1 Ferrule Fuse, 500VAC/500VDC

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Model: A6Y3-1

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

$81.79
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Mersen Amp-Trap® A6Y Type 1 Ferrule Fuse, 500VAC/500VDC

The Mersen Amp-Trap® A6Y is a Form 600 current-limiting fuse, one of the original current-limiting fuse designs predating today's standards. This family is offered across a Motor FLA range of 3A through 15A, giving specifiers a single dependable platform to cover a range of motor-circuit protection needs. Every rating in the family shares the same 500VAC and 500VDC dual voltage rating (DC through 600A capability by design), Type 1 dimensional interchangeability with Class H and K fuses, ferrule connection/terminal type with clip mounting, tin-plated copper terminals, and a GMG body/insulating material for dependable, code-compliant overcurrent protection.

Key Features

  • Motor FLA Range: Available in 3A, 10A, and 15A ratings to match motor full-load-amp requirements across a range of applications.
  • Connection/Terminal Type: Ferrule terminals with clip mounting for secure, low-resistance connections common to every rating in the family.
  • Durable Construction: Tin-plated copper terminal material paired with a GMG body/insulating material for reliable performance.
  • Dual AC/DC Rating: Rated voltage DC UL of 500V, with AC/DC operation for special fusing applications where a 500V DC rating is required.
  • High Interrupting Capacity: AC max I.R./breaking capacity (I1) of 200 kA for a high degree of current limitation across every FLA option.
  • Frequency Rating: Rated for 50/60 Hz systems.
  • L/R Time Constant: 10 ms L/R rating supports demanding DC circuit protection needs.
  • Type 1 Interchangeability: Dimensionally interchangeable with Class H and K fuses for straightforward replacement regardless of the FLA rating selected.
  • Packaging: Supplied 10 EA per package for stocking and maintenance needs.

Certifications & Compliance

  • Rated Voltage DC UL: 500 V

Technical Specifications

  • Motor FLA Options: 3A, 10A, 15A
  • Connection/Terminal Type: Ferrule
  • Mounting: Clip
  • Connection/Terminal Material: Tin-Plated Copper
  • AC Max I.R./Breaking Capacity: I1: 200 kA
  • Frequency (Hz): 50/60 Hz
  • AC or DC: AC/DC
  • L/R (ms): 10 ms
  • Rated Voltage DC UL: 500 V
  • Body/Insulating Material: GMG

Typical Applications

  • Current-Limiting Overcurrent Protection in AC and DC Circuits
  • Motor Branch Circuit Protection Across a Range of FLA Ratings
  • Special Fusing Applications Requiring 500V DC Ratings
  • Industrial and Commercial Electrical Equipment Protection
  • Replacement for Class H and K Fuse Applications
  • Panelboard, Switchgear, and Control Circuit Protection

Why Mersen?

Mersen's Form 600 Amp-Trap® fuses were the original current-limiting fuses, offering a high degree of current limitation in both AC and DC applications well before industry standards existed. With tin-plated copper ferrule terminals, a GMG body/insulating material, a 200 kA breaking capacity, and Type 1 dimensional interchangeability with Class H and K fuses, the A6Y family delivers dependable, code-compliant overcurrent protection across its 3A-15A Motor FLA range for demanding electrical systems.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Connection Terminal Type:
Ferrule
Mounting Method:
Clip
Connection/Terminal Material:
Tin-Plated Copper
AC Max I.R./Breaking Capacity: I1:
200 kA
Frequency (Hz):
50/60 Hz
AC or DC:
AC/DC
L/R (ms):
10 ms
Rated voltage DC UL:
500 V
Body/Insulating Material:
GMG
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fuse
Product Material:
GMG
Connection Type:
Ferrule
Voltage Rating:
500VAC/500VDC
Amperage Rating:
3A - 15A
Product Finish:
Tin-Plated Copper
Product Subgroup:
Fuses

Mersen A6Y3-1 – Frequently Asked Questions

1) Will a Mersen A6Y fuse drop into my existing Class H fuse clips?
Yes. The A6Y is a Type 1 fuse, dimensionally interchangeable with Class H and Class K fuses, so it drops into the same clips without rework. It uses ferrule terminals with clip mounting, which is the same arrangement those fuses use. What changes is performance, not fit: the A6Y is a current-limiting Form 600 design with a 200 kA AC interrupting rating, where standard Class H fuses are not current-limiting.
2) Can I use the Mersen A6Y on a 500V DC circuit, or is it AC only?
It is rated for both: 500VAC and 500VDC, with a UL DC rated voltage of 500 V. The DC side carries a 10 ms L/R time constant, which is what tells you it will clear an inductive DC circuit of that character. On AC it is rated for 50/60 Hz systems. That dual rating is the reason people reach for the A6Y in special fusing applications where a 500V DC rating is required rather than a standard AC-only branch fuse.
3) Should I use a ferrule fuse like the Mersen A6Y or a Class CC midget fuse for motor branch protection?
It depends on the fuse block already in the equipment. The A6Y is a Type 1 ferrule fuse on clip mounting, interchangeable with Class H and K, so it suits older switches and panelboards built for that envelope, and it brings a 500VDC rating that midget fuses generally do not. If your equipment takes a Class CC rejection-style holder instead, you need a Class CC fuse, such as the Littelfuse CCMR Series time-delay fuse, and the A6Y will not fit that holder. Class CC and Type 1 ferrule bodies are not interchangeable.
4) Can a Littelfuse BLF midget fuse be used in place of a Mersen A6Y ferrule fuse?
No. The Mersen Amp-Trap A6Y is rated 500VAC/500VDC and is dimensionally interchangeable with Class H and K fuses, with ferrule terminals in clip mounting. The Littelfuse BLF is a midget fast-acting fuse rated 250V on a laminated tube body, which is a different case size and a lower voltage rating. If the switch or panel is built for Class H/K ferrule clips, the A6Y drops into those clips; a midget body does not fill the same clip spacing.
5) I need a DC-rated fuse for a 500V DC circuit - is a Littelfuse AGU or AGA glass fuse an option?
For a 500V DC circuit, stay with the Mersen Amp-Trap A6Y. It carries a 500 V rated voltage DC UL, is specified for AC/DC service, and has a 10 ms L/R time constant, which is what qualifies it for DC circuit protection. The Littelfuse AGA series and AGU series are AG glass tube fuses; a glass tube automotive-style AG fuse is a different construction class and is not the part to reach for when a 500V DC rating is the requirement.
6) My motor starter calls for a Class CC time-delay fuse - how does that differ from the Mersen A6Y?
They are different fuse classes and are not interchangeable in the same holder. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A, which uses the rejection-style Class CC mounting. The Mersen Amp-Trap A6Y is a Form 600 current-limiting fuse with Type 1 dimensional interchangeability with Class H and K fuses, ferrule connection with clip mounting, and a Motor FLA range of 3A through 15A. Match the class the fuse block was built for, then pick the amp rating.
7) What amp ratings does the Mersen A6Y ferrule fuse come in?
Three ratings are offered, covering a motor full-load-amp range of 3A to 15A: A6Y3-1 at 3A, A6Y10-1 at 10A, and A6Y15-1 at 15A. You size to the motor FLA on the nameplate, so a 10A FLA motor takes the A6Y10-1. All three share the same 500VAC/500VDC rating, ferrule terminals and 200 kA AC interrupting capacity, so stepping between ratings does not change the fit or the fault rating.
8) Is 200 kA interrupting enough for my service, and what does current-limiting actually buy me here?
200 kA is the AC maximum interrupting rating, so the fuse covers available fault current up to that figure, which is above what most industrial services deliver at the equipment. Because the A6Y is a current-limiting Form 600 design, it also cuts the peak let-through current and energy during a fault rather than just interrupting it, which is what lets downstream equipment be protected on a high-fault bus. A non-current-limiting Class H fuse in the same clips does not do that.
9) Can I use a glass automotive-style fuse instead of the Mersen A6Y?
No. Glass tube fuses like the Littelfuse AGA and AGU series are low-voltage electronic and automotive style devices, not a substitute for a 500VAC/500VDC current-limiting fuse with a 200 kA interrupting rating on a motor branch circuit. If you are replacing an A6Y, stay with a Type 1 ferrule fuse sized to the motor FLA.
10) We stock Square D PowerLogic meter fuse packs - do those cover the same protection as the Mersen A6Y?
No, they serve different jobs. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses intended for metering circuits. The Mersen Amp-Trap A6Y covers motor branch circuit and general current-limiting overcurrent protection across a 3A to 15A Motor FLA range at 500VAC/500VDC, with a 200 kA AC breaking capacity. A half-amp metering fuse will not carry a motor branch load.
11) Which fuse should I use for a low-amperage control or electronics circuit rather than the Mersen A6Y?
For small control and electronics circuits the Littelfuse AGA series, offered in a 5A glass fuse, and the Littelfuse AGU series AG glass tube fuse are the lighter-duty glass tube options. The Mersen Amp-Trap A6Y is built for branch-circuit work: tin-plated copper ferrule terminals, a GMG body, clip mounting, and a 200 kA AC breaking capacity on 50/60 Hz systems. Choose by the fault current the circuit can deliver and by the holder already in the equipment.
12) How is the Mersen A6Y packaged, and is it sold individually?
The A6Y is supplied 10 each per package. For maintenance stocking that works out well, since a panel with three-phase feeders burns fuses in sets of three and keeping a box of 10 on the shelf per rating covers replacements without a reorder.
13) What are the A6Y terminals made of, and will they corrode in a damp plant environment?
Terminals are tin-plated copper, which gives you the conductivity of copper with a plating that resists oxidation at the clip contact, the spot where resistance and heating cause trouble. The body and insulating material is GMG. Between the two, it holds up in typical industrial panel and switchgear service.
How fast can I get the Mersen A6Y3-1 delivered?
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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 A6Y3-1 come with a warranty?
Absolutely. The Mersen A6Y3-1 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 A6Y3-1?
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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