Mersen A6T10 Class T Fast-Acti...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$62.17
Mersen A6T10 Class T Fast-Acting Fuse, 600VAC/300VDC

Mersen A6T10 Class T Fast-Acting Fuse, 600VAC/300VDC

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Model: A6T10

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

$62.17
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Mersen A6T10 Class T Fast-Acting Fuse, 600VAC/300VDC

The Mersen A6T10 is a Class T fast-acting fuse from the Amp-Trap® line, engineered to combine high current-limitation with a compact physical size for demanding AC/DC power protection applications. Rated 600VAC and 300VDC with an AC maximum interrupting rating (I1) of 200 kA, this fuse operates at 50/60 Hz and is built with a durable glass melamine (GMG) body for superior dimensional stability. The A6T10 is available with a choice of connection type — Blade or Ferrule — letting engineers and contractors match the fuse to the physical configuration of their disconnect, panelboard, or fusible enclosure without sacrificing performance. Regardless of connection type selected, the shared 600VAC/300VDC dual voltage rating, 200 kA interrupting capacity, and GMG body construction remain constant across the family. Unique physical dimensions on every A6T10 fuse prevent substitution of fuses carrying lower voltage ratings or reduced current-limiting capability, protecting the integrity of the circuit design. The A6T10 is RoHS compliant, making it suitable for environmentally conscious commercial and industrial installations that require dependable, code-compliant overcurrent protection.

Key Features

  • Voltage Rating: 600VAC / 300VDC for versatile AC and DC circuit protection in a single fuse design.
  • Durable Construction: Glass melamine (GMG) body delivers superior dimensional stability for reliable long-term performance in the field.
  • Fast-Acting Class T Design: Combines high current-limitation with a small physical size, ideal for space-constrained panelboards, disconnects, and enclosures.
  • High Interrupting Capacity: AC maximum interrupting rating (I1) of 200 kA breaking capacity supports demanding fault-current environments.
  • Connection Options: Available in Blade or Ferrule connection types to match the physical configuration of the intended fuse holder or disconnect.
  • Copper Terminals: Copper connection/terminal material supports dependable, low-resistance electrical contact.
  • 50/60 Hz Frequency: Compatible with standard AC power systems used throughout commercial and industrial facilities.
  • Permanent Identification: Catalog numbers are stamped directly into the fuse blades for lasting, tamper-resistant identification during maintenance and replacement.
  • Unique Rejection Dimensions: Sizing prevents substitution of fuses with lower voltage or current-limiting ratings, safeguarding system protection levels.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • ROHS Compliant: Yes
  • Body/Insulating Material: GMG
  • Connection Type Options: Blade, Ferrule

Typical Applications

  • Industrial and Commercial Electrical Systems
  • Motor and Equipment Overcurrent Protection
  • Panelboards and Switchgear Requiring Class T Fuses
  • Circuits Requiring High Current-Limiting Protection
  • Combined AC/DC Power Distribution Systems
  • Disconnect Switches and Fusible Enclosures

Why Mersen?

Mersen's A6T10 Amp-Trap® fuses are built with a glass melamine body for dimensional stability and feature permanently stamped catalog numbers to prevent misidentification in the field. With a 200 kA AC interrupting rating, a 600VAC/300VDC dual rating, a choice of Blade or Ferrule connection, and RoHS compliance, the A6T10 delivers code-compliant, high current-limiting protection that engineers and electrical contractors can rely on for professional installations.

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Manufacturer Resources

Mersen Product Catalog

Product Specs

Connection/Terminal Material:
Copper
AC Max I.R./Breaking Capacity: I1:
200 kA
ROHS Compliant:
Yes
Frequency (Hz):
50/60 Hz
Speed/Characteristic:
Fast-Acting
AC or DC:
AC/DC
Fuse Class:
Class T
Body/Insulating Material:
GMG
list_batch:
MERSEN-20260825
Department:
Electrical
Product Group:
Circuit Protection
Product Type:
Fast-Acting Fuse
Product Material:
Glass Melamine (GMG)
Voltage Rating:
600VAC
Listing:
RoHS Compliant
Product Subgroup:
Fuses

Mersen A6T10 – Frequently Asked Questions

1) What is the difference between the blade and ferrule versions of the Mersen A6T10?
Only the terminal style. The ferrule version is cataloged A6T10 and the blade version is A3T110. Voltage rating, the 200 kA AC interrupting rating, the glass melamine body and copper terminals are the same on both. Pick the one that matches how your fuse holder, disconnect or block grips the fuse: clip-style holders take ferrule ends, bolt-down blocks take blades.
2) Will a 200 kA fuse satisfy an available fault current calculation on my service?
The A6T10 carries an AC maximum interrupting rating (I1) of 200 kA, which covers available fault current up to that value at 600VAC or less. That is the top end for Class T and is why these get specified at service entrances and on large switchgear where calculated fault current runs high. Being current-limiting, it also reduces let-through energy to downstream equipment.
3) Is a fast-acting Class T fuse the right choice for a motor circuit, or do I need a time-delay fuse?
The A6T10 is fast-acting, which suits feeders, switchgear and equipment where you want the fastest clearing and the lowest let-through energy. Motor branch circuits with heavy inrush usually want a time-delay fuse so the fuse rides through starting current. For that duty, look at a Class CC time-delay like the Littelfuse CCMR Series (CCMR040 is the 40A version) rather than a fast-acting Class T.
4) Can a Littelfuse CCMR040 Class CC fuse be used in place of a Mersen A6T10 Class T fuse?
No. The Mersen A6T10 is a Class T fast-acting fuse, while the Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A. The two are different fuse classes with different bodies and holders, so a Class CC fuse will not fit a Class T fuse block, and the CCMR is a time-delay element rather than fast-acting. Use the A6T10 where the equipment or drawing calls for Class T protection.
5) Can I drop a lower voltage fuse into a Class T holder meant for the A6T10?
No. Class T fuses use rejection dimensions, and the A6T10's physical size blocks installation of fuses with a lower voltage rating or weaker current-limiting performance. That is deliberate: it keeps someone from defeating the protection level the circuit was designed around during a service call. Replace like for like, and read the catalog number stamped into the fuse blades to confirm what came out.
6) Can I use a midget or glass tube fuse in place of a Class T fuse?
No. Class T is a specific body and mounting dimension with its own rejection sizing, so a midget or automotive-style glass tube fuse will not fit a Class T block and will not match the 600VAC/300VDC and 200 kA ratings. Products like the Littelfuse BLF Series midget fast-acting fuse are 250V rated, and the AGA and AGU glass tube series are small-equipment fuses, not substitutes for a Class T in a panelboard or disconnect.
7) Why are Class T fuses specified when panel space is tight?
Class T packs high current-limiting performance into a notably small envelope compared with other 600V fuse classes, which is the reason it gets specified inside crowded panelboards, switchgear and fusible enclosures where a larger fuse class will not physically fit the gear. The A6T10 keeps the full 600VAC/300VDC and 200 kA ratings in that compact form.
8) Is a Littelfuse AGA or AGU glass tube fuse an acceptable replacement for a Mersen A6T10?
No. The Littelfuse AGA series and AGU series are AG-style glass tube fuses used for small electronic and automotive-style circuits. The Mersen A6T10 is a Class T power fuse with a glass melamine body, 600VAC/300VDC rating and a 200 kA AC interrupting rating for panelboards, disconnects and fusible enclosures. Its rejection dimensions are also intentionally sized to block fuses with lower voltage or current-limiting ratings from being installed.
9) My meter has a Square D PowerLogic fuse pack in it - do I order the Mersen A6T10 instead?
No. The Square D PowerLogic energy meter fuse pack is a set of three 0.5A 600V fuses sized for metering voltage-sensing leads. The Mersen A6T10 is a Class T fast-acting power fuse for branch and feeder overcurrent protection at 600VAC/300VDC. Keep the metering fuse pack for the meter inputs and use the A6T10 only where the Class T block or disconnect calls for it.
10) My fuse block takes ferrule-style fuses, not blades - is there a Mersen option for that?
Yes. The A6T10 is offered in both Blade and Ferrule connection types, so you can match the fuse to the physical configuration of the holder, disconnect or panelboard without changing the electrical protection. Both share the 600VAC/300VDC rating, 200 kA AC interrupting rating, copper terminals and GMG body.
11) Why does the A6T10 use a glass melamine body instead of a plastic or fiber tube?
Glass melamine (GMG) holds its dimensions under heat and mechanical load, which matters on a rejection-style fuse where the body size is part of how the fuse is kept from being mis-substituted. Paired with copper terminals for low-resistance contact, it is built for long service in panelboards and fusible disconnects rather than a one-off bench application.
12) Is the Mersen A6T10 RoHS compliant for a spec that requires it?
Yes, the A6T10 is RoHS compliant, which is the compliance point most commonly called out on institutional and sustainably specified electrical submittals for fuses.
13) How do I identify the Class T fuse I am replacing during maintenance?
Mersen stamps the catalog number directly into the fuse blades, so the identification survives dirt, heat and label loss. Pull the fuse, read the stamped number, and match it. On the Amp-Trap Class T line the ferrule version is A6T10 and the blade version is A3T110.
How fast can I get the Mersen A6T10 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 A6T10 come with a warranty?
Absolutely. The Mersen A6T10 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 A6T10?
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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