Bussmann KTN-R-45 LIMITRON Cla...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$345.83
$229.50
Bussmann KTN-R-45 Eaton series KTN-R fuse, LIMITRON Fast-acting fuse, Panelboards, 45 A, 1, Class RK1, Non-indicating, Standard, 250 V

Bussmann KTN-R-45 LIMITRON Class RK1 Fast-Acting Fuse, 45A, 250V, Non-Indicating

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Model: KTN-R-45

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

$345.83
$229.50
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Bussmann KTN-R-45 LIMITRON Class RK1 Fast-Acting Fuse, 45A, 250V, Non-Indicating

The Bussmann KTN-R-45 is an Eaton Bussmann series KTN-R LIMITRON fast-acting fuse engineered for panelboard overcurrent protection. Rated 45A at 250V, this Class RK1 fuse features a non-indicating, standard single-element design for dependable, code-compliant circuit protection in commercial and industrial electrical systems. Built to the demanding standards professional electricians expect from Bussmann, the KTN-R-45 is a direct, reliable replacement for panelboard fuse applications where consistent fast-acting performance is required, and its compact, standardized form factor makes it a straightforward drop-in solution for maintenance, retrofit, and new panelboard installations alike.

Key Features

  • Amperage Rating: 45A rating supports panelboard branch circuit overcurrent protection.
  • Fuse Class: Class RK1 LIMITRON fast-acting design delivers reliable interruption of overcurrent conditions.
  • Voltage Rating: 250V rating suits standard panelboard distribution systems.
  • Non-Indicating Design: Standard non-indicating construction requires no blown-fuse indicator for straightforward installation.
  • Single-Element Construction: One fuse element (Number Of Elements: 1) simplifies panelboard replacement.
  • Compact Footprint: Measures approximately .81 in wide by .81 in high by 3 in long, weighing about .9 lb for easy handling.
  • Standard Grade: Standard-grade LIMITRON construction consistent with Eaton Bussmann series KTN-R specifications.
  • Application: Purpose-built LIMITRON series fuse for panelboards in commercial and industrial electrical distribution.

Technical Specifications

  • Compliances: Not Applicable
  • Number Of Elements: 1
  • Product Height: .81 in
  • Product Length Depth: 3 in
  • Product Weight: .9 lb
  • Product Width: .81 in

Typical Applications

  • Panelboard Overcurrent Protection
  • Commercial and Industrial Electrical Distribution
  • Branch Circuit Protection
  • Replacement Fuse for Existing Panelboard Fuse Systems
  • Maintenance and Retrofit Fuse Replacement Projects

Why Bussmann?

Bussmann by Eaton is a trusted name in overcurrent protection, and the KTN-R-45 LIMITRON fuse delivers the fast-acting, Class RK1 performance electrical professionals rely on for panelboard applications. Its standard, non-indicating single-element design offers a straightforward, dependable replacement option rated for 45A at 250V, helping maintain safe, code-compliant electrical distribution systems in commercial and industrial facilities. Choosing a genuine Eaton Bussmann series KTN-R fuse means specifying a component built to consistent manufacturing standards for predictable, repeatable overcurrent protection across your panelboard fleet.

Manufacturer Resources

Product Specs

Amperage Rating:
45A
Class:
Class RK1
Compliances:
Not Applicable
Fuse Indicator:
Non-indicating
Number Of Elements:
1
Packaging Type:
Standard
Product Height:
.81 in
Product Length Depth:
3 in
Product Weight:
.9 lb
Product Width:
.81 in
Voltage Rating:
250V
Department:
Electrical
Product Type:
Fast-Acting Fuse
Product Group:
Circuit Protection
Product Subgroup:
Fuses
Product Length:
3 in

Bussmann KTN-R-45 – Frequently Asked Questions

1) Will a Bussmann KTN-R-45 fit a Class R fuse block or rejection clip?
Yes. The KTN-R-45 is a Class RK1 fuse, which means it carries the Class R rejection groove on the blade and drops into Class R rejection blocks and switches. It measures .81 x .81 x 3 inches, the standard 250V Class R case size for this amp range. Note the rejection feature works one way: a Class R fuse goes into a non-rejection Class H or K holder, but an old non-rejection fuse will not go into a Class R block.
2) Can I use a 250V KTN-R-45 on a 480V circuit?
No. The KTN-R-45 is rated 250 V and must not be applied above that. For a 480V or 600V panel you need the 600V equivalent of the LIMITRON fast-acting Class RK1 line, the KTS-R series, in the same 45A size. Voltage rating on a fuse is a maximum, never a target, so a 250V fuse on a 480V system can fail to interrupt safely.
3) What is the difference between a fast-acting KTN-R and a time-delay FRN-R fuse at 45 amps?
Both are Class RK1, 250V, and physically interchangeable, but they clear differently. The KTN-R-45 is a single-element fast-acting fuse, so it opens quickly on overload and is suited to circuits with little or no inrush: panelboard branch circuits, feeders, resistive loads, and solid-state equipment that needs the let-through held down. A dual-element time-delay fuse in the same class is what you want ahead of a motor, transformer, or anything with a starting surge, because the fast-acting unit will nuisance-open on that inrush.
4) Is the KTN-R-45 a blown fuse indicating type?
No, it is a non-indicating fuse. There is no visual pop-up or window to show it has opened, so an electrician checks it with a meter or continuity test rather than by eye. If your maintenance procedure relies on spotting a blown fuse at a glance, specify an indicating version instead.
5) What is the exact Bussmann part number and series for this 45A Class RK1 fuse?
The part number is KTN-R-45, from the Eaton Bussmann series KTN-R LIMITRON line. The KTN prefix is the 250V fast-acting family, the R suffix is the Class R rejection body, and 45 is the amp rating. Catalogued as a fuse at 45 A, 250 V, non-indicating, single element.
6) Does the KTN-R-45 ship as a single fuse or a box?
The KTN-R-45 is supplied in standard packaging and is identified by the single manufacturer part number KTN-R-45. Fuses are normally replaced in sets of two or three depending on whether the circuit is single or three phase, so order the quantity your panel needs rather than one.
How fast can I get the Bussmann KTN-R-45 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 KTN-R-45 come with a warranty?
Absolutely. The Bussmann KTN-R-45 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 KTN-R-45?
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 KTN-R-45 from ZenSupply?
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