Product Overview
Limitron KTK-3: A Fast-Acting 3 Amp Midget Fuse With The Label Still Crisp
Condition
Condition is New, unused new old stock. In the photos the label wrap is intact and fully legible, with the brown and white Limitron print, the KTK-3 type designation inside its Symbol and Amp box, and the UL mark all readable. The end caps are bright metal with uneven darker patches across them, the ordinary look of a fuse that has spent years on a shelf, and a small trace of label adhesive shows at one cap edge. Stock is two, so the photographed piece is representative and this listing sells one fuse.
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Product Overview
The Bussmann Limitron KTK-3 is a midget cartridge fuse in the standard 13/32 inch by 1-1/2 inch format, and laid against the ruler in the photos the body measures approximately 1-1/2 inches long. The wrap carries the Limitron name, the words fast-acting FUSE, a white box headed Symbol and Amp holding the type designation KTK-3, the line For 600 volts or less AC, and the phrase A BUSS QUALITY FUSE, alongside a UL mark reading LISTED 448H MISC. FUSE. The 3 amp rating is the -3 in that KTK-3 symbol and is the rating our records carry for this part - no standalone 3 AMP text is printed on the wrap. That miscellaneous fuse category is the supplemental listing, which is the role the KTK family fills: quick protection for control circuits, small transformer primaries, and instrument circuits rather than branch-circuit duty. The end caps are bright metal and the tube under the wrap is light colored. No interrupting rating and no DC rating appear in the label areas the photos show, so both are Not confirmed - verify against the Bussmann datasheet before use.
Key Features
- Marked KTK-3 on the label, the Limitron fast-acting type designation
- 3 amp rating carried by the -3 in the KTK-3 symbol, not printed as separate 3 AMP text
- Marked For 600 volts or less AC
- UL mark reads LISTED 448H MISC. FUSE, the supplemental fuse category
- Midget cartridge format, approximately 1-1/2 inches long against the ruler
- Bright metal end caps, light colored tube body under the label wrap
- No blown-fuse indicator is visible on this sample
- Interrupting rating not visible in the photographed label areas - Not confirmed, verify against the Bussmann datasheet before use
Applications
- A panel builder dropping a 3 amp supplemental fuse into a standard midget holder on a control circuit
- A maintenance tech replacing a blown KTK-3 in a legacy control cabinet where the print names the part outright
- A machine shop protecting a small control transformer primary or a lighting branch that calls for a fast-acting midget fuse
- A test bench or instrument fixture that needs quick 3 amp protection in a 13/32 inch by 1-1/2 inch clip
Frequently Asked Questions
What does the label actually say?
Reading around the wrap in the photos: Limitron, fast-acting FUSE, a white box headed Symbol and Amp holding KTK-3, For 600 volts or less AC, A BUSS QUALITY FUSE, and a UL mark reading LISTED 448H MISC. FUSE. The amp value is not printed on its own - it is the -3 in the KTK-3 symbol.
What holder does it fit?
It is the standard midget size, nominally 13/32 inch diameter by 1-1/2 inches long, and against the ruler the body measures approximately 1-1/2 inches. It drops into midget fuse blocks and clips cut for that size.
Is this a branch-circuit fuse?
No. The UL mark on this fuse reads MISC. FUSE, which is the supplemental listing, not a branch-circuit Class CC listing. Use it where the drawing calls for supplemental protection, and specify the Class CC version if your application requires one.
What is the interrupting rating?
It is not visible in the label areas our photos show, and we do not have documentation for this specific vintage in hand. Not confirmed - verify against the Bussmann datasheet before use.
Why buy one fuse here instead of a minimum-order box?
Because you probably need one, and a distributor will sell you ten. This is a known KTK-3 with a legible label, photographed against a ruler and in the hand so you can see exactly what the marking says before you commit, priced as a single fuse with two on the shelf. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A fuse is the one part in the cabinet hired to fail first, and Buss built the KTK to get it over with quickly. Put it in the holder and hope it stays the most boring component you own.
