We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Transparent cylindrical fuse with metal bolt-on end caps

Mersen

Mersen A50QS350-4 Semiconductor Fuse 350A 500V AC Bolt-On

SKU CH-K1Z4-XWSHW

Fast-acting semiconductor fuse rated 350 A at 500 V AC with 200 kA interrupt capacity and bolt-on mounting

  • TypeFuses & Accessories
  • ColorTransparent
  • High interrupt rating protects circuits with 200kA at 500V AC
  • Fast-acting response limits damage during semiconductor fault events
  • Bolt-on body style enables secure mounting in power assemblies
  • UL Recognized and CSA Certified for code-compliant installations
  • Equivalent to A50QS, FWH and L50S series for direct replacement

Mersen A50QS350-4 Semiconductor Fuse

The Mersen A50QS350-4 is a fast-acting semiconductor fuse rated for 350A at 500V AC and 500V DC. It is designed for electrical engineers and maintenance technicians protecting power semiconductors in industrial equipment. The bolt-on body style allows secure mounting directly onto busbars or terminal blocks. This non-indicating fuse suits applications where visual blown-status indication is not required.

Interrupt rating and voltage headroom

The fuse delivers an interrupt rating of 200kA at 500V AC and 87kA at 500V DC, providing substantial fault-current clearance for heavy industrial supplies. It comfortably handles continuous loads up to its 350A rating within the A50P series envelope. The single-element construction ensures predictable fast-acting response under short-circuit conditions. Systems requiring higher interrupt capacity or different voltage ratings will need a different fuse class.

Bolt-on mounting constraint

The 4-3/8 inch length by 1-1/2 inch diameter fiberglass body uses a bolt-on termination that dictates panel layout and busbar drilling patterns. Installers must verify that the physical footprint and mounting hardware match the existing hardware before ordering. The non-rejection design means it fits standard A50QS, FWH and L50S clips without a keying feature. Buyers needing rejection-style or indicating fuses cannot use this part.

Highlights

  • High interrupt rating protects circuits with 200kA at 500V AC
  • Fast-acting response limits damage during semiconductor fault events
  • Bolt-on body style enables secure mounting in power assemblies
  • UL Recognized and CSA Certified for code-compliant installations
  • Equivalent to A50QS, FWH and L50S series for direct replacement

Specifications

BrandMERSEN
TypeFuses & Accessories
ColorTransparent

Questions about this item

Will the 350 A rating coordinate with an existing 350 A semiconductor fuse in my DC bus?

Yes — both carry 350 A at 500 V DC and share an 87 kA interrupt rating, so they will open together under the same fault conditions.

How can I confirm the fuse operated correctly after a fault event?

The body is transparent and non-indicating; after a trip you must remove it and verify continuity with a multimeter — no visual flag or striker appears.

What hardware is included for the bolt-on mounting?

Only the fuse body with its two bolt-on terminals is supplied; mounting bolts, washers and any bus-bar lugs must be purchased separately.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.