Bussmann KTU-400 Series LIMITR...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5,407.89
Bussmann KTU-400 Series LIMITRON Fast-Acting Fuse, 400A

Bussmann KTU-400 Series LIMITRON Fast-Acting Fuse, 400A

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Model: KTU-400
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$5,407.89
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Bussmann KTU-400 Series LIMITRON Fast-Acting Fuse, 400A

The Bussmann KTU-400 is part of the Eaton Bussmann series KTU fuse line, a LIMITRON fast-acting fuse engineered to deliver dependable overcurrent protection at a 400A rating. Fast-acting fuse construction provides a rapid response to short-circuit and overload conditions, making the KTU-400 a trusted choice for electrical systems that demand consistent, code-compliant performance. Compact, rugged dimensions support straightforward installation in standard fuse mounting configurations across industrial and commercial electrical equipment.

Key Features

  • Amperage Rating: Rated at 400A for dependable overcurrent protection in demanding electrical systems.
  • Fast-Acting Design: LIMITRON fast-acting fuse technology responds quickly to short-circuit and overload conditions, helping protect connected equipment.
  • Eaton Bussmann Series KTU: Part of the recognized KTU series, engineered for consistent, code-compliant overcurrent protection.
  • Compact Footprint: Measures 2.5 in height x 2.5 in width x 8.63 in length, fitting standard fuse mounting configurations.
  • Rugged Build: Solid 3.75 lb construction supports durability in industrial-duty electrical panels and switchgear.

Technical Specifications

  • Compliances: Not Applicable
  • Product Height: 2.5 in
  • Product Length Depth: 8.63 in
  • Product Weight: 3.75 lb
  • Product Width: 2.5 in

Typical Applications

  • Branch Circuit Overcurrent Protection
  • Panelboard and Switchboard Fuse Protection
  • Industrial Motor Control Circuits
  • Commercial and Industrial Electrical Equipment
  • Disconnect Switch and Fusible Switch Assemblies

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the KTU series LIMITRON fast-acting fuse reflects that standard with dependable 400A performance. Electrical professionals specify Bussmann fuses for consistent, code-compliant overcurrent protection across industrial and commercial installations. Choose the Bussmann KTU-400 for reliable fast-acting protection backed by the Eaton Bussmann series KTU design and rugged, compact construction built for demanding electrical panels and switchgear applications.

Manufacturer Resources

Product Specs

Amperage Rating:
400A
Compliances:
Not Applicable
Product Height:
2.5 in
Product Length Depth:
8.63 in
Product Weight:
3.75 lb
Product Width:
2.5 in
Department:
Electrical
Product Type:
Fast-Acting Fuse
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Product Length:
8.63 in

Bussmann KTU-400 – Frequently Asked Questions

1) Will a Bussmann KTU-400 fit the fuse clips in my existing 400A fusible switch?
The KTU-400 is a bolt-style Class L body measuring 8.63 inches long by 2.5 inches wide by 2.5 inches high, so it needs mounting pads spaced for that length, not spring clips. If your 400A disconnect uses a clip-mounted cartridge fuse, the KTU will not drop in. Check that your switch has bolted fuse pads and at least 8.63 inches of clearance between them before ordering.
2) Is a fast-acting fuse like the Bussmann KTU-400 the right choice for a motor circuit?
Fast-acting is the key distinction. The KTU-400 LIMITRON clears short circuits and overloads quickly, which suits feeders, panelboards, and switchboard protection where there is no large inrush. On a motor circuit with a high starting current, a fast-acting fuse can open on normal inrush, so motor branch circuits are usually protected with a time-delay (dual-element) fuse instead and the fast-acting type is reserved for the short-circuit protection side of motor control assemblies.
3) What amp rating is the Bussmann KTU-400 and can I use it in place of a lower-rated fuse?
It is rated 400 A. Never substitute it for a smaller fuse in the same holder, because the overcurrent device must match the conductor and equipment rating on the drawing. If your switch is fused at 200A or 300A, order that rating in the same KTU series rather than the 400.
4) What exact part number should I order for a Bussmann 400A LIMITRON fast-acting fuse?
Order Bussmann KTU-400. That is the manufacturer part number for the 400 amp fast-acting LIMITRON in the Eaton Bussmann KTU series, and it is the number to put on a purchase order or hand to a distributor.
5) How heavy is a KTU-400 fuse, and does that matter for mounting?
Each one weighs 3.75 lb. That is worth knowing for two reasons: a fuse that size is bolted rather than clipped, so the hardware carries the weight, and if you are stocking a shelf of spares for a facility the case weight adds up fast. Plan on bolted pads torqued to the switch maker's spec.
How fast can I get the Bussmann KTU-400 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 KTU-400 come with a warranty?
Absolutely. The Bussmann KTU-400 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 KTU-400?
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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