Mersen Amp-Trap A50QS Series H...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$172.43
Mersen Amp-Trap A50QS Series High-Speed Blade Fuse, 500VAC/500VDC

Mersen Amp-Trap A50QS Series High-Speed Blade Fuse, 500VAC/500VDC

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Model: A50QS80-4

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

$172.43
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Mersen Amp-Trap A50QS Series High-Speed Blade Fuse, 500VAC/500VDC

The Mersen Amp-Trap A50QS Series High-Speed Blade Fuse delivers fast-acting overcurrent protection rated 500VAC/500VDC for demanding electrical systems. Built with tin-plated copper blade terminals and a GMG insulating body, this bolted-mount fuse achieves a 63 kA breaking capacity for reliable fault interruption in high-capacity circuits. The 250A-rated model measures 4.34 in. and weighs 0.68 lb, offering a compact footprint for space-constrained panels, and RoHS compliant construction rounds out a fuse engineered for professional-grade power protection.

Key Features

  • Ampere Rating: 250A current rating handles substantial electrical loads while providing precise overcurrent protection for high-capacity circuits and equipment.
  • Dual Voltage Rating: 500VAC/500VDC dual voltage capability supports both AC and DC applications for flexible installation options.
  • Breaking Capacity: 63 kA breaking capacity ensures reliable fault current interruption in demanding electrical environments.
  • High Speed Characteristic: Fast-acting response protects sensitive equipment and circuits from damage during overcurrent conditions.
  • Blade Terminal Connection: Tin-plated copper blade terminals provide secure, bolted mounting and reliable electrical connections.
  • GMG Insulating Body: Professional-grade insulating construction delivers excellent dielectric strength and mechanical durability.
  • Compact Footprint: 4.34 in. length and 0.68 lb weight simplify installation in space-constrained panels and enclosures.
  • Corrosion-Resistant Finish: Tin-plated copper terminals resist corrosion for long-term connection reliability.

Certifications & Compliance

  • RoHS Compliant

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Industrial Motor Control Centers
  • Commercial Power Distribution Systems
  • Data Center Electrical Protection
  • Manufacturing Equipment Protection
  • Critical Infrastructure Facilities
  • High-Capacity Electrical Panels

Why Mersen?

Mersen delivers proven reliability in electrical protection with RoHS compliant construction and professional-grade materials throughout the Amp-Trap A50QS Series. Combining a GMG insulating body with tin-plated copper blade terminals, these high-speed fuses achieve 63 kA breaking capacity and dual 500VAC/500VDC voltage compatibility, making them a dependable choice for critical, code-compliant electrical installations.

Manufacturer Resources

Mersen Product Catalog

Product Specs

Product Type:
High-Speed Fuse
Voltage Rating:
500VAC/500VDC
Connection Type:
Blade
Product Finish:
Tin-Plated Copper
Product Material:
GMG
Standards:
RoHS Compliant
Department:
Electrical
Product Group:
Wiring Devices

Mersen A50QS80-4 – Frequently Asked Questions

1) Will a Mersen A50QS fuse work on a 500V DC bus, or is it AC only?
Both. The Amp-Trap A50QS high-speed fuse carries a dual 500VAC/500VDC rating, so the same part protects an AC feed or a DC link without switching to a separate DC-rated fuse. That matters on drive and rectifier work where the input side is AC and the bus side is DC. Do not apply it above 500V on either side.
2) Do A50QS fuses drop into a clip-style fuse holder?
No. The A50QS-4 is a blade-terminal fuse, bolted through the blades to busbar or to a bolt-down base. It will not seat in a ferrule or cartridge clip holder. If your panel has spring clips, you need a clip-mount fuse, not this one, or a bolted base to land the blades on.
3) Is a high-speed fuse like the A50QS the right choice for protecting a VFD or rectifier, or should I use a standard time-delay fuse?
High-speed is the right family for semiconductor protection. The A50QS clears fast specifically to keep let-through energy below what diodes, SCRs and IGBTs can survive; a time-delay class fuse is built to ride through motor inrush and will let a device fail before it opens. Use time-delay on the motor branch, high-speed on the power electronics. The A50QS is rated 500VAC/500VDC with a 63 kA breaking capacity, which covers the fault levels on most industrial drive and MCC feeds.
4) Can the A50QS be used where the available fault current is 50 kA?
Yes. The A50QS is rated for a 63 kA breaking capacity, which covers a 50 kA available fault current at up to its 500VAC/500VDC rating. That is the number your engineer needs for the short circuit study, and it is why this fuse gets specified on high-capacity panels and service-entrance-fed distribution rather than a lower-interrupting device.
5) What amp ratings does the Mersen A50QS blade fuse come in?
Five ratings across the A50QS-4 blade series: 80A (A50QS80-4), 150A (A50QS150-4), 200A (A50QS200-4), 250A (A50QS250-4) and 400A (A50QS400-4). All share the same 500VAC/500VDC rating and blade terminal style, so sizing up or down within the group does not change the mounting method, only the physical body size.
6) What do I order to standardize A50QS fuses across a plant?
Order by the full Mersen part number, since the only thing that changes across the group is the ampere rating: A50QS80-4, A50QS150-4, A50QS200-4, A50QS250-4, A50QS400-4. Voltage rating, blade connection and body material are identical across all five, so one spare-parts standard covers every circuit, and stocking one or two ratings as spares covers a fleet of drives.
7) Are the A50QS fuse terminals plated, and will they hold up in a humid plant environment?
The blades are tin-plated copper. Tin plating resists the oxidation that builds resistance at a bolted joint, so the connection stays low-resistance over time in damp or process environments. The body is GMG insulating material for dielectric strength and mechanical toughness in the panel.
8) Is the Mersen A50QS RoHS compliant for a facility spec that requires it?
Yes, the A50QS high-speed fuse is built RoHS compliant, which is the compliance line institutional and government specs most often ask for on electrical components. That is the standard stated for this fuse.
How fast can I get the Mersen A50QS80-4 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 A50QS80-4 come with a warranty?
Absolutely. The Mersen A50QS80-4 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 A50QS80-4?
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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