Bussmann KTK-R Series Midget F...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$76.79
Bussmann KTK-R Series Midget Fuse, 600V

Bussmann KTK-R Series Midget Fuse, 600V

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Model: KTK-3/4

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

$76.79
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Bussmann KTK-R Series Midget Fuse, 600V

The Bussmann KTK-R Series is a 600V-rated midget-style fuse family engineered to deliver precise, dependable overcurrent protection across a wide range of low-to-moderate current applications. Available in amperage ratings from 0.125 Amp through 7.5 Amp (0.125 Amp, 0.2 Amp, 0.25 Amp, 0.6 Amp, 0.75 Amp, 2.5 Amp, 3.5 Amp, and 7.5 Amp), the KTK-R family lets electricians, panel builders, and OEMs select the exact protective device needed for a given circuit while relying on a single, industry-standard midget fuse footprint. This compact form factor fits standard midget fuse holders, fuse blocks, and disconnect switches, making the KTK-R series well suited to protecting sensitive control, instrumentation, and low-current circuits from damaging overcurrent conditions. The shared 600V voltage rating across every amperage option simplifies specification, stocking, and cross-referencing for maintenance and design teams.

Key Features

  • Amperage Range: Available from 0.125 Amp up to 7.5 Amp, allowing precise selection for a wide variety of control and instrumentation circuits.
  • Voltage Rating: Rated for use on systems up to 600V, giving installers flexibility across a range of circuit voltages regardless of the amperage option selected.
  • Midget Fuse Form Factor: Compact midget-style body fits standard midget fuse holders, blocks, and disconnects commonly found in industrial and commercial panels.
  • KTK-R Series Consistency: Every amperage option shares the same series designation and physical footprint, offering consistent sizing and performance for cross-reference and replacement purposes.
  • Precise Current Ratings: With eight amperage options spanning 0.125 Amp to 7.5 Amp, the series is specifically sized for low-current circuits, helping avoid nuisance fuse replacement while still protecting downstream components.
  • Easy Identification: The KTK-R model designation clearly identifies the series, while each amperage rating is clearly marked, simplifying fuse selection, stocking, and replacement.
  • Space-Saving Design: The small physical size of the midget fuse allows for higher packing density in panels and control cabinets where space is limited.

Technical Specifications

  • Series: KTK-R
  • Voltage Rating: 600V
  • Amperage Options: 0.125 Amp, 0.2 Amp, 0.25 Amp, 0.6 Amp, 0.75 Amp, 2.5 Amp, 3.5 Amp, 7.5 Amp
  • Form Factor: Midget Fuse

Typical Applications

  • Control Circuit and Control Transformer Protection
  • Instrumentation and Low-Current Circuit Protection
  • Industrial and Commercial Panelboards
  • OEM Equipment and Machine Control Panels
  • Motor Control Circuits
  • General-Purpose Overcurrent Protection in 600V-Rated Systems

Why Bussmann?

Bussmann is a widely recognized name in circuit protection, and the KTK-R Series midget fuse family reflects that standard with a clearly defined 600V voltage rating shared across every amperage option, from 0.125 Amp up to 7.5 Amp, in a compact midget form factor. For electricians, panel builders, and maintenance professionals who depend on accurate, code-compliant overcurrent protection, choosing a Bussmann KTK-R fuse means specifying a device built to a recognized rating and footprint. Its compact midget sizing and clearly marked ratings support dependable performance and straightforward replacement across the full range of amperage options in professional electrical and industrial installations.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Fast-Acting Fuse
Voltage Rating:
600V
Series:
KTK-R
Department:
Electrical
Product Subgroup:
Fuses
list_batch:
BUSS-20260919
Configuration:
Midget Fuse
Product Group:
Circuit Protection

Bussmann KTK-3/4 – Frequently Asked Questions

1) Will a Bussmann KTK-R midget fuse fit a standard midget fuse holder or block?
Yes. The KTK-R is a midget-style fuse, so it drops into standard midget fuse holders, fuse blocks and disconnect switches commonly used in industrial and commercial panels. Every amperage option in the series shares the same midget footprint, so the holder does not change when you change the rating.
2) What amperage ratings does the Bussmann KTK-R midget fuse come in?
Low-current ratings only: 0.10, 0.125, 0.2, 0.25, 0.6, 0.75, 2.5, 3.5 and 7.5 amp. That spread is sized for control, instrumentation and transformer primary circuits. If you need something above 7.5 amp, the KTK-R ratings here will not cover it.
3) Can I use a KTK-R fuse on a 480V or 600V control circuit?
The KTK-R carries a 600V rating, so it covers 480V and 600V systems as well as anything below. The rating is the same across every amperage in the series, which means you can standardize one voltage class across a panel and only vary the amp rating per circuit.
4) What part number do I order for a 1/4 amp Bussmann KTK-R fuse?
The 0.25 amp version is KTK-R-1/4. The fractional amp ratings follow the same pattern: KTK-1/10 for 0.10 amp, KTK-1/8 for 0.125 amp, KTK-2/10 for 0.2 amp, KTK-6/10 for 0.6 amp and KTK-3/4 for 0.75 amp. Above one amp you get KTK-2-1/2, KTK-R-3-1/2 and KTK-7-1/2.
5) Is a midget fuse the right choice for protecting a control transformer primary?
It is one of the stated uses for the KTK-R series, along with instrumentation and other low-current circuits, motor control circuits, and general overcurrent protection on 600V-rated systems. The appeal for control work is physical: the midget body packs tightly into a crowded control cabinet where a full-size class fuse and block would not fit. For feeder or branch circuits at higher amperage you need a larger class of fuse, not a midget.
6) Can I mix KTK-R amperages in the same panel without changing fuse blocks?
Yes, and that is the main reason maintenance teams standardize on the series. Every rating from 0.10 amp through 7.5 amp shares the KTK-R series designation, the same 600V rating and the same physical footprint, so a fuse block or holder set up for one rating accepts any other in the family. Only the amp marking on the fuse changes.
7) How do I identify which KTK-R fuse is in a panel before I replace it?
Each fuse carries the KTK series designation and its amperage rating marked on the body, so you can read the rating off the installed fuse and order the matching one. Ratings available run 0.10 through 7.5 amp, all at 600V, which means a visual read of the amp marking is usually enough to specify the replacement.
How fast can I get the Bussmann KTK-3/4 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 KTK-3/4 come with a warranty?
Absolutely. The Bussmann KTK-3/4 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 KTK-3/4?
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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