Mersen A70QS High-Speed Fuse, ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$247.17
Mersen A70QS High-Speed Fuse, 700VAC/700VDC Dual-Voltage, Bolted Blade Terminal

Mersen A70QS High-Speed Fuse, 700VAC/700VDC Dual-Voltage, Bolted Blade Terminal

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Model: A70QS60-4

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

$247.17
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Mersen A70QS High-Speed Fuse, 700VAC/700VDC Dual-Voltage, Bolted Blade Terminal

The Mersen A70QS high-speed fuse is an Amp-Trap protection device built for demanding industrial and commercial circuits, combining a dual 700VAC/700VDC voltage rating with a 250A ampere rating and a 50 kA breaking capacity for reliable fault clearing. Bolted blade connection terminals in tin-plated brass pair with a GMG body insulating material to deliver secure mounting, dependable conductivity, and durable electrical isolation. This RoHS compliant, high-speed characteristic fuse is engineered to minimize equipment damage and downtime when short-circuit conditions occur.

Key Features

  • 250A Ampere Rating: Handles substantial current loads while providing precise overcurrent protection for high-capacity circuits.
  • 700VAC/700VDC Dual Voltage: Versatile voltage compatibility supports both AC and DC applications in industrial and commercial installations.
  • 50 kA Breaking Capacity: High interrupting rating ensures reliable fault clearing even under severe short-circuit conditions.
  • High Speed Characteristic: Fast-acting protection minimizes equipment damage and system downtime during fault conditions.
  • Bolted Blade Connection: Secure mounting method with tin-plated brass terminals ensures reliable electrical connections and easy installation.
  • Durable Construction: GMG body insulating material provides excellent electrical isolation and mechanical durability.
  • Compact Design: Product length of 5.09 in and weight of 0.95 lb facilitate straightforward installation in space-constrained enclosures.
  • 50/60 Hz Frequency Rating: Rated for standard AC frequency applications across North American and international power systems.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Ampere Rating: 250 A
  • AC or DC: AC/DC
  • AC Max Breaking Capacity (I1): 50 kA
  • Rated Voltage AC: 700 V
  • Rated Voltage DC: 700 V
  • Speed Characteristic: High Speed
  • Body Insulating Material: GMG
  • Connection Terminal Material: Tin-Plated Brass
  • Connection Terminal Type: Blade
  • Mounting Method: Bolted
  • Frequency: 50/60 Hz
  • Product Length: 5.09 in
  • Product Weight: 0.95 lb
  • RoHS Compliant: Yes

Typical Applications

  • Industrial Motor Control Centers
  • Commercial Power Distribution Systems
  • Manufacturing Equipment Protection
  • Data Center Power Infrastructure
  • Process Control Systems
  • Heavy Machinery Applications

Why Mersen?

Mersen high-speed fuses deliver proven reliability with RoHS compliant construction and professional-grade materials, including GMG body insulation and tin-plated brass bolted blade terminals. The compact 5.09 in length and lightweight 0.95 lb design simplify installation while the 50 kA breaking capacity and 700VAC/700VDC dual-voltage rating maintain robust, code-compliant protection for critical electrical systems.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
Fuse
Product Material:
GMG
Voltage Rating:
700VAC/700VDC
Amperage Rating:
250A
Connection Type:
Bolted Blade
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Wiring Devices

Mersen A70QS60-4 – Frequently Asked Questions

1) Will a Mersen A70QS fuse work on a 600V DC drive circuit?
Yes. The A70QS carries a dual rating of 700VAC and 700VDC, so the same fuse covers both AC and DC circuits up to 700V. That DC rating is the part worth noting: plenty of fuses are rated for AC only, or carry a much lower DC number. A 600V DC bus sits inside the A70QS rating. It also carries a 50 kA breaking capacity for fault clearing on high-available-fault systems.
2) What amp ratings does the Mersen A70QS high-speed fuse come in?
Three amperages: 60A, 80A and 250A, ordered as A70QS60-4, A70QS80-4 and A70QS250-4. All three share the 700VAC/700VDC dual rating and the bolted blade terminal, so stepping between them changes the ampere rating and the body size, not the mounting style or the voltage class.
3) Does the A70QS drop into a fuse clip holder, or does it have to be bolted?
Bolted only. The A70QS uses blade connection terminals in tin-plated brass that bolt to the bus or fuse block, so it needs a bolt-down base, not a spring clip. If your panel is built around clip-style holders, this is the wrong body style and you want a ferrule or midget cartridge fuse instead, like the Littelfuse BLF Series midget fast-acting fuse.
4) What is a high-speed fuse for, and do I need one instead of a standard fuse?
High-speed (semiconductor) fuses like the Mersen A70QS Amp-Trap exist to protect silicon: diodes, SCRs, IGBTs and the rectifier sections of drives and converters. They clear a short far faster than a general-purpose branch fuse, because a semiconductor junction fails in milliseconds. If what you are protecting is a motor branch circuit, a transformer or a feeder, a high-speed fuse is the wrong tool, and a time-delay class fuse such as the Littelfuse CCMR Series Class CC is the usual choice. Use the A70QS where the load is a power electronic device.
5) Can a Littelfuse CCMR Class CC time-delay fuse be used in place of a Mersen A70QS high-speed fuse?
No - they protect different things. The Mersen A70QS is a high-speed fuse rated 700VAC/700VDC with a bolted blade connection, sized to clear a fault fast enough to save semiconductor devices such as drive and rectifier stacks. The Littelfuse CCMR040 is a Class CC time-delay fuse rated 40A, and time-delay is the opposite characteristic: it is built to ride through inrush on motor and transformer loads rather than open quickly. Putting a time-delay fuse ahead of power electronics lets the fault energy through that the A70QS is there to cut off, and the CCMR040 carries a Class CC ferrule body rather than the bolted blade terminal an A70QS holder accepts.
6) What is the difference between a Mersen A70QS fuse and a Littelfuse BLF midget fuse?
Voltage class and construction separate them. The Mersen A70QS carries a dual 700VAC/700VDC rating and lands on bolted blade terminals, which is what a 700V drive or DC bus section calls for. The Littelfuse BLF is a midget fast-acting fuse rated 250V in a laminated tube body, a control-circuit and branch-protection part that tops out well below a 700V bus. BLF and A70QS also share no mounting method - the midget tube seats in clips or a midget block, while the A70QS bolts down. If the circuit is 250V control wiring, the BLF is the part that fits it; at 700V, it is not a candidate.
7) How do I order the right Mersen A70QS, and what does the -4 suffix mean?
Order by the full part number with the amperage in it: A70QS60-4, A70QS80-4 or A70QS250-4. The number after A70QS is the ampere rating and the -4 is the body and terminal style designation in that series, so you cannot mix a -4 part into a mounting base built for a different suffix. Match the suffix to the fuse block already in the panel.
8) Is a Littelfuse AGU or AGA glass tube fuse an equivalent to the Mersen A70QS?
No. The Littelfuse AGU is an AG glass tube fuse and the Littelfuse AGA5 is a 5A glass fuse in the AGA series - small cartridge parts for low-current electronics, accessory and automotive-style circuits. The Mersen A70QS is an Amp-Trap high-speed power fuse offered in 60A, 80A and 250A ratings with a GMG body and tin-plated brass bolted blade terminals. The glass-bodied AG parts and the A70QS do not share a holder, a body material or a current class, so an AGU or AGA5 is never a drop-in for an A70QS position. Where the load genuinely is a few amps of electronics, the AGA5 at 5A is the part built for it.
9) I need fuses for a metering circuit, not the main feed - should I order the Mersen A70QS or something else?
Metering taps take an instrument fuse, not a power fuse. The Square D PowerLogic energy meter fuse pack is supplied as a set of three at 0.5A 600V, which is the scale a potential-transformer or meter input actually draws. The Mersen A70QS is a high-speed fuse built for 700VAC/700VDC power circuits in ratings from 60A up to 250A on bolted blade terminals, and at those ampere ratings it would never open on a metering-circuit fault. Use the PowerLogic pack on the meter inputs and reserve the A70QS for the drive, rectifier or DC bus protection it is sized for.
10) Is the Mersen A70QS RoHS compliant for an export or spec job?
Yes, the A70QS is RoHS compliant, which is what an institutional or OEM spec usually asks for on component-level electrical parts. Materials are a GMG body for insulation and tin-plated brass blade terminals.
11) Can I use the A70QS on 50 Hz power overseas?
Yes. The A70QS is rated 50/60 Hz, so it works on both North American 60 Hz systems and 50 Hz supplies without a different part number. The 700V AC rating and 50 kA breaking capacity apply across that frequency range.
12) Can I use one A70QS for a metering or control circuit instead of a dedicated meter fuse?
You would be oversizing badly. The A70QS starts at 60A, which is a power-circuit rating; a potential-transformer or meter input draws a fraction of an amp and needs a small fuse sized for it, such as the Square D PowerLogic energy meter fuse pack at 0.5A 600V. Keep the A70QS on the semiconductor power path.
How fast can I get the Mersen A70QS60-4 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 A70QS60-4 come with a warranty?
Absolutely. The Mersen A70QS60-4 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 A70QS60-4?
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