Mersen A70QS Series Cylindrica...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$159.20
Mersen A70QS Series Cylindrical Semiconductor Fuse, 700V Ferrule Mount

Mersen A70QS Series Cylindrical Semiconductor Fuse, 700V Ferrule Mount

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Model: A70QS50-14F

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

$159.20
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Mersen A70QS Series Cylindrical Semiconductor Fuse, 700V Ferrule Mount

The Mersen A70QS Series is a line of Premium Amp-trap French cylindrical semiconductor fuses built for demanding power electronics applications. These solid-fill, ceramic-body fuses are IEC rated 690VAC with 200kA interrupting capacity and 700VDC with 100kA interrupting capacity at a 10ms time constant, with an additional 890VDC rating for capacitor discharge applications up to 2.5ms time constant. Ferrule mount construction and an ampere range of 10 to 800 A make this series suitable for small inverter drives, UPS systems, solid state relays, and motor drives, with superior I²t for improved semiconductor protection and performance.

Key Features

  • Ampere Range: Available from 10 to 800 A to match a wide range of semiconductor protection needs.
  • Durable Construction: Ceramic body with solid-fill design for reliable, repeatable performance.
  • Ferrule Mount: Ferrule connection terminal in international 14 x 51mm and 22 x 58mm sizes for design versatility and worldwide acceptance.
  • Voltage Rating: 690VAC IEC rated (tested at 760VAC, usable up to 750VAC in the U.S.) and 700VDC rated for dc protection of equipment with L/R <= 10ms/c.
  • Capacitor Discharge Rating: 890VDC rating for capacitor discharge applications up to 2.5ms time constant.
  • Interrupting Rating: 200 kA AC and 100 kA DC interrupting capacity for high-fault-current environments.
  • Cyclic Loading: Superior cycling ability for longer service life on difficult cyclic loading applications.
  • Striker Option: All ampere ratings are available with a striker for auxiliary signaling.

Certifications & Compliance

  • UL Recognized Component, E76491 JFHR2.E76491
  • CSA Certified, 1422-30
  • IEC 269-4 Compliance

Technical Specifications

  • Body Style: Cylindrical Non Rejection
  • Mounting: Clip
  • AC Voltage: 690 VAC
  • DC Voltage: 700 VDC
  • Connection Terminal Type: Ferrule
  • Speed / Characteristic: High-Speed
  • Ampere Range: 10 to 800 A
  • I.R. AC: 200 kA
  • I.R DC: 100 kA
  • Body Material: Ceramic

Typical Applications

  • Small Inverter Drives
  • UPS Systems
  • Solid State Relays
  • Motor Drives
  • Semiconductor Protection for 700V or Less Equipment

Why Mersen?

Mersen's A70QS Series combines a rugged ceramic body with solid-fill construction and ferrule mount terminals to deliver dependable semiconductor protection at 690VAC/700VDC. Backed by UL Recognized Component and CSA Certified listings and built to IEC 269-4 compliance, these fuses provide the low I²t performance professional electrical and power electronics applications require.

Manufacturer Resources

Mersen Product Catalog

Product Specs

list_batch:
MERSEN-20260825
Product Type:
Semiconductor Fuse
Product Material:
Ceramic
Connection Type:
Ferrule
Voltage Rating:
690VAC
Amperage Rating:
10-800A
Listing:
UL Recognized Component
Standards:
IEC 269-4
Configuration:
Cylindrical Non Rejection
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Mersen A70QS50-14F – Frequently Asked Questions

1) Will a Mersen A70QS fuse protect my 480V drive's IGBTs, or do I need a different voltage class?
The A70QS Series is rated 690VAC per IEC and 700VDC, so it covers a 480V drive with margin. It is tested at 760VAC and usable up to 750VAC in the U.S. For dc-side protection the 700VDC rating applies where the circuit time constant L/R is 10ms or less. There is also an 890VDC rating specifically for capacitor discharge duty up to a 2.5ms time constant. If your equipment runs above 700V dc in normal service, this is the wrong class.
2) Will A70QS fuses fit my existing fuse clips, or do they need a rejection holder?
These are cylindrical non-rejection fuses with ferrule ends, designed for clip mounting. Non-rejection means the body has no keying feature, so they drop into standard clips sized for the body rather than requiring a dedicated rejection base. The ferrule bodies are the international 14 x 51mm and 22 x 58mm sizes, so match your holder to the correct one of those two before ordering.
3) Can I use a regular glass or midget fuse instead of a semiconductor fuse in a drive?
No. A70QS is a high-speed semiconductor fuse with low I2t, built to clear fast enough to save diodes, SCRs and IGBTs. General-purpose fuses like the Littelfuse AGU glass tube or the Littelfuse BLF midget fast-acting 250V fuse protect wiring and general loads, not power semiconductors, and the BLF's 250V class is far below the 690VAC the A70QS carries. For branch circuit and motor-controller duty a time-delay Class CC like the Littelfuse CCMR040 is the right tool; for the semiconductor bridge itself it is not.
4) Is the Mersen A70QS UL listed for my panel submittal?
It is a UL Recognized Component under file E76491, category JFHR2.E76491, and CSA Certified under 1422-30. It is also built to IEC 269-4. Recognized Component status means it is accepted as part of a larger listed assembly rather than as a standalone listed device, which is the normal path for drive and UPS panel builds.
5) What amp ratings does the Mersen A70QS high-speed fuse come in?
The A70QS Series spans 10 to 800 A. That range lets you use one series across a small inverter drive, a UPS input, a solid state relay, and larger motor drive sections instead of mixing families. Every ampere rating in the series is also offered with a striker for auxiliary signaling if you need fuse-blown indication wired back to a controller.
6) What fault current can the A70QS fuse interrupt?
200 kA on AC and 100 kA on DC. The DC figure is stated at a 10ms time constant. That AC interrupting capacity covers service entrance and large industrial switchboard fault levels, so the fuse is not the limiting element in most high-fault installations.
7) Will these fuses survive repeated start-stop cycling on a motor drive?
Cyclic duty is one of the things the A70QS is built around. The ceramic body with solid-fill construction gives repeatable performance, and Mersen calls out superior cycling ability for longer service life on difficult cyclic loading applications. That matters on drives that ramp frequently, where a fuse not rated for cycling ages and nuisance-opens.
8) Which model number is the 50 amp 14 x 51mm A70QS fuse?
That is Mersen part A70QS50-14F. The 14F suffix identifies the 14 x 51mm ferrule body, so order a holder or clip set sized for that body, not the larger 22 x 58mm.
How fast can I get the Mersen A70QS50-14F 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 A70QS50-14F come with a warranty?
Absolutely. The Mersen A70QS50-14F 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 A70QS50-14F?
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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