Bussmann KTK-R crosses to Marathon Special Products CC-F. Both are Class CC fast acting fuses rated 600 VAC. The table lists 26 ratings from 1/10 A to 30 A, with the Mersen ATMR and Littelfuse KLKR numbers on the same line. Every line is an exact amp-for-amp match.
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Bussmann KTK-R to Marathon CC-F cross reference
| Bussmann | Amps | Marathon | Mersen | Littelfuse |
|---|---|---|---|---|
| KTK-R-1/10 | 1/10 A | CC-F1/10 | ATMR1/10 | KLKR.100 |
| KTK-R-1/5 | 1/5 A | CC-F2/10 | ATMR1/5 | KLKR.200 |
| KTK-R-1/4 | 1/4 A | CC-F1/4 | ATMR1/4 | KLKR.250 |
| KTK-R-3/10 | 3/10 A | CC-F3/10 | ATMR3/10 | KLKR.300 |
| KTK-R-1/2 | 1/2 A | CC-F1/2 | ATMR1/2 | KLKR.500 |
| KTK-R-3/5 | 3/5 A | CC-F6/10 | ATMR3/5 | KLKR.600 |
| KTK-R-3/4 | 3/4 A | CC-F3/4 | ATMR3/4 | KLKR.750 |
| KTK-R-1 | 1 A | CC-F1 | ATMR1 | KLKR001 |
| KTK-R-1-1/4 | 1-1/4 A | CC-F1-1/4 | ATMR1-1/4 | KLKR01.25 |
| KTK-R-1-1/2 | 1-1/2 A | CC-F1-1/2 | ATMR1-1/2 | KLKR01.5 |
| KTK-R-2 | 2 A | CC-F2 | ATMR2 | KLKR002 |
| KTK-R-2-1/2 | 2-1/2 A | CC-F2-1/2 | ATMR2-1/2 | KLKR02.5 |
| KTK-R-3 | 3 A | CC-F3 | ATMR3 | KLKR003 |
| KTK-R-3-1/2 | 3-1/2 A | CC-F3-1/2 | ATMR3-1/2 | KLKR03.5 |
| KTK-R-4 | 4 A | CC-F4 | ATMR4 | KLKR004 |
| KTK-R-5 | 5 A | CC-F5 | ATMR5 | KLKR005 |
| KTK-R-6 | 6 A | CC-F6 | ATMR6 | KLKR006 |
| KTK-R-7 | 7 A | CC-F7 | ATMR7 | KLKR007 |
| KTK-R-8 | 8 A | CC-F8 | ATMR8 | KLKR008 |
| KTK-R-9 | 9 A | CC-F9 | ATMR9 | KLKR009 |
| KTK-R-10 | 10 A | CC-F10 | ATMR10 | KLKR010 |
| KTK-R-12 | 12 A | CC-F12 | ATMR12 | KLKR012 |
| KTK-R-15 | 15 A | CC-F15 | ATMR15 | KLKR015 |
| KTK-R-20 | 20 A | CC-F20 | ATMR20 | KLKR020 |
| KTK-R-25 | 25 A | CC-F25 | ATMR25 | KLKR025 |
| KTK-R-30 | 30 A | CC-F30 | ATMR30 | KLKR030 |
All Marathon CC-F fuses on this page are Class CC, fast acting, 600 VAC. Matching rule: same fuse class, same voltage, same operating type and the exact amp rating. Marathon also makes CC-F3/20 (3/20 A); none of the three competitor catalogs lists that rating, so it is not crossed here.
Fast acting or time delay?
KTK-R, ATMR, KLKR and CC-F are fast acting Class CC fuses. They suit control circuits, lighting and other loads with low inrush. For control transformer primaries and small motors, prints often call for a time delay Class CC fuse such as Bussmann FNQ-R. Marathon makes a time delay Class CC series, CC-T. Send the part number and we will confirm which one you need.
Control transformers
Class CC fuses often protect a control transformer primary. See control transformers by kVA for the transformer side.
Common questions
What is the Marathon equivalent of Bussmann KTK-R-10?
Marathon Special Products CC-F10 is the Class CC fast acting fuse at 10 A and 600 VAC. Mersen ATMR10 and Littelfuse KLKR010 are the same rating.
Is Marathon CC-F fast acting or time delay?
CC-F is the Class CC fast acting series, 600 VAC, 1/10 A to 30 A. The CC-T series is the Class CC time delay fuse.
Which Marathon fuse crosses Mersen ATMR or Littelfuse KLKR?
The same CC-F catalog number. Match the amp rating: ATMR5 and KLKR005 both cross to CC-F5.
Why are some Marathon CC-F numbers written in tenths?
Marathon writes some fractional ratings in tenths. CC-F2/10 is 1/5 A and crosses KTK-R-1/5. CC-F6/10 is 3/5 A and crosses KTK-R-3/5.
Get a cross-referenced quote
Send the Bussmann, Mersen or Littelfuse part number and the quantity. We send back the Marathon match, the lead time and a quote. Need help with fuses and holders for a panel? Book a time and we will go through the application.
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More cross references: all cross references · Bussmann LPJ to Marathon CJ-T · Marathon for data centers and BESS · Marathon Special Products collection
Bussmann and KTK-R are trademarks of Eaton. Mersen and ATMR are trademarks of Mersen. Littelfuse and KLKR are trademarks of Littelfuse, Inc. Applied Control Inc. is not affiliated with, endorsed by, or sponsored by these companies. Competitor part numbers appear here only to identify products for comparison. Confirm the final selection against the current manufacturer datasheets before purchase or installation.