Bussmann ACK-250 Time-Delay St...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$191.50
Bussmann ACK-250 Time-Delay Stud-Mount Fuse, 250A, 80Vdc

Bussmann ACK-250 Time-Delay Stud-Mount Fuse, 250A, 80Vdc

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Model: ACK-250

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

$191.50
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Bussmann ACK-250 Time-Delay Stud-Mount Fuse, 250A, 80Vdc

The Bussmann ACK-250 is a time-delay fuse from the Eaton Bussmann Series ACK line, engineered specifically for lift truck and battery charger circuits where reliable, code-compliant overcurrent protection is critical. Rated 250A at 80 Vdc, this stud-mounted, one-time-use fuse is built to protect demanding industrial DC power systems from sustained overloads while allowing normal motor and charger inrush current to pass without nuisance clearing. The ACK-250's time-delay characteristic is precisely defined: it clears in approximately 100 seconds at 200% of rated current, 35 seconds at 300% of rated current, and 13 seconds at 500% of rated current, giving electricians and equipment technicians a predictable response curve for coordinating circuit protection in material handling and battery-powered vehicle systems.

Key Features

  • Amperage Rating: 250A rating sized for lift truck and battery charger DC circuit protection in demanding industrial-duty applications.
  • Voltage Rating: 80 Vdc rating matched to common industrial battery and battery charger system voltages.
  • Time-Delay Response Curve: Clears in 100 seconds at 200% of rated current, 35 seconds at 300% of rated current, and 13 seconds at 500% of rated current, allowing normal motor and charger inrush while still responding to sustained overload conditions.
  • Stud Mounting: Stud-mount terminal design provides a secure, low-resistance mechanical and electrical connection in compatible fuse blocks and fuse holders.
  • One-Time Use Fuse: Sacrificial fusible element construction typical of the Bussmann ACK series; the fuse must be replaced after it opens in response to a fault or sustained overload.
  • Series ACK Design: Part of the Eaton Bussmann Series ACK fuse family, a product line engineered specifically for lift truck and battery charger overcurrent protection applications.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Lift Truck Electrical Systems
  • Battery Charger Circuits
  • Industrial Material Handling Equipment
  • DC Power Distribution and Overcurrent Protection
  • Battery-Powered Industrial Vehicle Service

Why Bussmann?

Bussmann by Eaton is a long-established name in circuit protection, and the Series ACK fuse line is engineered with clearly defined time-delay response points at 200%, 300%, and 500% of rated current so technicians can predict how the fuse will behave under overload conditions. The stud-mount terminal design and 250A, 80 Vdc rating make the ACK-250 a dependable, purpose-built choice for protecting lift truck and battery charger circuits in industrial and material handling environments. As a one-time-use, time-delay fuse, the ACK-250 is intended to be replaced after it clears a fault, ensuring the protected circuit is always guarded by a fuse operating within its original specifications.

Manufacturer Resources

Product Specs

Product Subgroup:
Fuses
Product Type:
Time-Delay Fuse
list_batch:
BUSS-20260919
Department:
Electrical
Series:
ACK
Product Group:
Circuit Protection
Product Width:
1.063 in
Product Height:
1.063 in

Bussmann ACK-250 – Frequently Asked Questions

1) What is the Bussmann ACK series fuse actually designed to protect?
The ACK series is purpose-built for lift truck and battery charger circuits, which is a DC application rather than general-purpose branch circuit protection. The time-delay element lets normal traction motor and charger inrush pass without clearing, then responds to sustained overload. If you are protecting industrial material handling equipment or DC power distribution on battery-powered vehicles, this is the right family; for AC branch circuits or control panels you want a different Bussmann line.
2) How fast does the Bussmann ACK-250 clear on an overload?
The response curve is published at three points: roughly 100 seconds at 200 percent of rated current, 35 seconds at 300 percent, and 13 seconds at 500 percent. That gives you fixed numbers to coordinate against upstream and downstream protection instead of guessing, and it is why charger and motor inrush does not nuisance-trip the fuse.
3) How does an ACK stud-mount fuse mount, and do I need a holder for it?
The terminals are stud type, so the fuse bolts into a compatible fuse block or holder rather than clipping into spring ferrule clips. The stud connection is what gives the low-resistance joint these high-current DC circuits need. You will need the matching block or holder with stud lugs on hand; it is not part of the fuse itself.
4) Is the Bussmann ACK-250 resettable, or does it have to be replaced after it blows?
It is a one-time-use fuse with a sacrificial fusible element. Once it opens on a fault or sustained overload it is finished and has to be swapped for a new one. For an MRO crib stocking lift truck spares, that means keeping replacements on the shelf rather than treating it like a resettable breaker.
5) What amperage ratings does the Bussmann ACK fuse come in?
Two ACK fuses are offered: the ACK-100 and the ACK-250. The number is the ampere rating, so 100A and 250A. Size to the circuit you are protecting, not to the old fuse's physical shape, since the ACK-100 and ACK-250 are different parts with different ratings.
6) Can I use a fast-acting fuse in place of an ACK time-delay fuse on a lift truck?
Not without nuisance clearing. The ACK line is specified as time-delay precisely because traction motors and battery chargers draw heavy inrush at startup; a fast-acting element of the same ampere rating will see that inrush as a fault. Match the time-delay characteristic as well as the ampere rating when you replace one.
How fast can I get the Bussmann ACK-250 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 Bussmann ACK-250 come with a warranty?
Absolutely. The Bussmann ACK-250 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 Bussmann ACK-250?
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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