Bussmann KTU Series LIMITRON C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2,691.27
Bussmann KTU Series LIMITRON Class L Fast-Acting Fuse, 600V

Bussmann KTU Series LIMITRON Class L Fast-Acting Fuse, 600V

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Model: KTU-1200

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

$2,691.27
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Bussmann KTU Series LIMITRON Class L Fast-Acting Fuse, 600V

The Bussmann KTU Series is a LIMITRON Fast-Acting fuse engineered for overcurrent protection in large distribution switchboards and power panelboards. Part of the Eaton Bussmann fuse line, this Class L fuse is rated 600 V with a 200 kAIC interrupt rating at 600 Vac, and is available in amp ratings from 1200A through 6000A (1200A, 2000A, 2500A, 3000A, 6000A) to match a range of distribution equipment requirements. The non-indicating, bolt-type design uses a melamine glass tube body with silver-plated end bells for dependable, long-term performance in demanding industrial and commercial power systems.

Key Features

  • Amp Rating Range: Available in 1200A, 2000A, 2500A, 3000A, and 6000A ratings to suit large distribution switchboards and power panelboards.
  • Fast-Acting Class L Design: LIMITRON Fast-Acting fuse element delivers reliable overcurrent protection in a Class L form factor.
  • High Interrupt Rating: 200 kAIC interrupt rating at 600 Vac supports use in high fault-current distribution systems.
  • Voltage Rating: Rated 600 V for standard large-scale distribution equipment applications.
  • Non-Indicating Fuse: Non-indicating construction suited to standard switchboard and panelboard installations.
  • Durable Tube & End Bells: Melamine glass tube body paired with silver-plated end bells for consistent electrical contact and long service life.
  • Bolt-Type Mounting: Standard bolt connection for secure installation in Class L fuse mounting hardware.

Technical Specifications

  • Voltage Rating: 600V
  • Amp Rating Range: 1200A - 6000A
  • Interrupt Rating: 200 kAIC at 600 Vac
  • Fuse Class: Class L

Typical Applications

  • Large Distribution Switchboards
  • Power Panelboards
  • Industrial and Commercial Electrical Systems
  • Class L Fuse Overcurrent Protection Applications

Why Bussmann?

Bussmann is a trusted name in circuit protection, and the KTU Series LIMITRON fuse reflects that reliability with its Class L design, 200 kAIC interrupt rating, and silver-plated end bells for consistent electrical contact. Backed by durable melamine glass tube construction, this fuse series is built for dependable, code-compliant overcurrent protection across a range of amp ratings in professional electrical distribution installations.

Manufacturer Resources

Product Specs

Class:
Class L
Mounting Method:
Bolt
Fuse Indicator:
Non-indicating
Interrupt Rating:
200 kAIC at 600 Vac
Voltage Rating:
600V
Packaging Type:
Standard
Department:
Electrical
Product Type:
Fast-Acting Fuse
Amperage Rating:
1200A - 6000A
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Bussmann KTU-1200 – Frequently Asked Questions

1) What amp ratings does the Bussmann KTU Class L fuse come in?
The KTU LIMITRON Class L line runs from 601A up to 6000A: KTU-601, 650, 750, 800, 1000, 1200, 1500, 1600, 2000, 2400, 2500, 3000, 3500, 4000 and 6000. Class L fuses start at 601A by definition, so if your switchboard needs 600A or less you are looking at a Class J, T or RK device instead, not a KTU.
2) Will a KTU fuse work in a 480V or 240V switchboard?
Yes. The KTU is rated 600V, which is a maximum, so it can be applied at 480Y/277V, 240V or any system voltage at or below 600V. Its interrupting rating is 200,000A at 600 Vac, which covers the fault current at large service entrance switchboards.
3) Is the Bussmann KTU a time-delay fuse or fast-acting?
Fast-acting. The KTU LIMITRON element has no intentional time delay, so on motor loads or transformer inrush it can nuisance open unless it is heavily oversized. For feeders with inrush, the time-delay Class L option is the Bussmann KRP-C SP LIMITRON. Use KTU where you want quick clearing on mains, switchboards and non-inductive feeders.
4) Can I use a Bussmann KTU in equipment with a 200,000A short circuit current rating?
Yes. The KTU interrupts 200 kAIC at 600 Vac, which meets the available fault current at most large service entrance and industrial distribution gear. As a current-limiting Class L fuse it also reduces let-through energy to downstream equipment.
5) How does a Class L fuse like the KTU mount in a switchboard?
Bolt-type. Class L fuses are not clip-mounted; the silver-plated end bells bolt directly to the bus or fuse mounting hardware, so you need the correct Class L mounting base and hardware for that amp rating. Check that the existing mounting centers match the fuse you order, since Class L body lengths change with the amp rating.
6) Does the KTU fuse have a blown-fuse indicator?
No. The KTU is non-indicating, so there is no visual pop-up or flag to tell you it has opened. Crews troubleshooting a dead switchboard will need to meter across each fuse. If your facility standard calls for indication, specify an indicating Class L fuse instead.
7) I need to replace a blown KTU-2000 - what exactly do I order?
Match the catalog number exactly: KTU-2000 for a 2000A, 600V fast-acting Class L. Do not substitute a different amp rating to get something on the shelf, and do not swap in a time-delay Class L without checking coordination, since the KTU is fast-acting. Neighboring sizes in the same family are KTU-1600 and KTU-2400.
8) Where are KTU LIMITRON fuses typically used?
Main and feeder protection in large distribution switchboards and power panelboards, on industrial and commercial power systems. Anything above 600A where the gear is built for bolt-in Class L fuses.
9) What is the KTU fuse body made of, and does it hold up in a hot switchgear room?
The body is a melamine glass tube with silver-plated end bells. Melamine handles the thermal and mechanical stress of a high-amp clearing event, and the silver plating keeps contact resistance low at the bolted joints, which matters most on the 3000A to 6000A sizes where any loose or oxidized connection runs hot.
How fast can I get the Bussmann KTU-1200 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-1200 come with a warranty?
Absolutely. The Bussmann KTU-1200 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-1200?
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
Why buy the Bussmann KTU-1200 from ZenSupply?
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