Ferraz Shawmut A50QS250-4 250A 500V Semiconductor Fuse

Retail Price: $359.04
Price: $94.50
  • SKUFS778F
In stock - 1 units available.
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Ferraz Shawmut A50QS250-4 Fuse

Stock photo shown for reference only. You will receive a unit of the listed catalog number in the condition stated above, inspected and tested to ESP Product Standards. Cosmetic appearance may vary.

1-Year Operational Guarantee Every breaker we sell — new, surplus, reconditioned, or used — is guaranteed to operate normally for one year from date of sale. Product Standards
Same-Day Shipping In-stock orders placed before 12pm PST typically ship the same business day, with UPS tracking provided. Shipping details
30-Day Returns Return authorization available within 30 days of receipt. Return policy
Talk to a Real Person Questions about fit, condition, or availability? Call 800-664-4377. Credit terms available for approved accounts.
Found this part for less somewhere else? Surplus and reconditioned prices vary widely with scarcity and condition — tell us what you found and make us an offer. Include the catalog number and we’ll respond same business day: call 800-664-4377 or email us. Every ESP unit is tested and backed by our 1-year operational guarantee — make sure you’re comparing like for like.

Description

The Mersen (Ferraz Shawmut) A50QS250-4 is a 250-amp, 500-volt AC/DC Amp-Trap Form 101 high-speed semiconductor fuse with bolted-blade terminals.

ManufacturerMersen / Ferraz Shawmut
SeriesAmp-Trap Form 101 A50QS
Catalog NumberA50QS250-4
Fuse ClassSemiconductor (high-speed)
Amperage250 A
Max Voltage500 V AC
DC Rating500 V DC (100 kA)
Interrupting Rating200 kA AC
SpeedVery fast-acting
Terminals / MountingBolted blade
ConditionSurplus, inspected and tested
Product StatusActive

More Details

Drive and rectifier repair often comes down to finding one exact fuse. The A50QS250-4 is a 250-amp member of Mersen's Form 101 A50QS series, rated 500 volts AC and DC, with bolted-blade terminals for direct mounting. It shows up in mid-size AC and DC drives, SCR power controllers, battery chargers and UPS rectifiers, wherever power semiconductors need protection that opens faster than a standard branch-circuit fuse. Its interrupting capacity is 200 kA AC and 100 kA DC. The equipment's documentation will call out this part number because the fuse's I²t is coordinated with the devices it protects. One tested surplus unit is available and ready to ship.

See the manufacturer's data sheet for A50QS250-4 specifications.

What is "surplus new"?

Surplus new means the item has never been installed or put into service. It may not arrive in its original packaging, but it has never been used.

What does "reconditioned" mean?

Reconditioned items have been inspected, cleaned, and tested to confirm they operate to the manufacturer's original specifications. Every reconditioned item we sell carries a one-year operational guarantee.

How fast will my order ship?

In-stock orders placed before 12pm PST usually ship the same business day via UPS, with tracking provided.

What if I can't find the item I need?

Call 800-664-4377 — we stock thousands of obsolete and hard-to-find electrical parts that may not yet be listed online.

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