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Transparent cylindrical fuse with bolt-on metal end caps

Mersen

Mersen A50QS80-4 Semiconductor Fuse 80A 500V AC Bolt-On video accessory

SKU CH-H4DB-SRAJR

Fast-acting semiconductor fuse rated 80 A and 500 V AC with 200 kA interrupt capacity and bolt-on mounting

  • TypeFuses & Accessories
  • ColorTransparent
  • Protects sensitive semiconductors with fast-acting 80 A response
  • Handles high-power circuits at 500 V AC and 500 V DC
  • Withstands massive fault currents up to 200 kA interrupt rating
  • Simplifies installation using bolt-on body style
  • Meets safety standards with UL Recognized and CSA Certified compliance

Mersen A50QS80-4 Semiconductor Fuse

The Mersen A50QS80-4 is a fast-acting semiconductor fuse rated at 80 A and 500 V AC. It uses a bolt-on body style for secure mounting in power circuits. The fuse carries UL Recognized and CSA Certified markings with an interrupt rating of 200 kA at 500 V AC. It suits engineers protecting sensitive semiconductor devices from overcurrent events.

Suited for high-power semiconductor protection

This fuse fits applications that require fast-acting response and a bolt-on connection. It is not for circuits needing visual indication of fuse status because the body is non-indicating. Buyers who want a rejection-style fuse or a different voltage rating should look at other series. The A50QS series covers this specific electrical profile only.

Bolt-on design integrates with bus-bar layouts

The 3-5/8 inch length and 1 inch diameter body sits directly on terminal pads without a separate holder. Fiberglass construction provides insulation in dense assemblies. The 87 kA DC interrupt rating supports 500 V DC systems as well. Equivalent series references include Bussmann FWH and Littelfuse L50S for cross-referencing existing bills of materials.

Highlights

  • Protects sensitive semiconductors with fast-acting 80 A response
  • Handles high-power circuits at 500 V AC and 500 V DC
  • Withstands massive fault currents up to 200 kA interrupt rating
  • Simplifies installation using bolt-on body style
  • Meets safety standards with UL Recognized and CSA Certified compliance

Specifications

BrandMERSEN
TypeFuses & Accessories
ColorTransparent

Questions about this item

What bolt-on fuse holder or bus-bar arrangement do I already need to mount this 80 A, 500 V AC semiconductor fuse?

You need a compatible bolt-on fuse block or bus-bar drilled for the 1-inch diameter body and 3-5/8-inch length so the fuse terminals can be bolted down securely.

Will this fast-acting A50QS fuse coordinate with the older branch-circuit breakers I plan to keep in the same panel?

Its 200 kA interrupt rating at 500 V AC lets it clear faults faster than standard breakers, so it can protect semiconductors downstream while the existing breakers handle overloads.

How can I confirm the fuse is intact and operating correctly after installation?

With power removed, measure continuity across the bolt-on terminals; a low resistance reading shows the single element is intact and the fuse is ready to protect the circuit.

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