Bussmann JJN crosses to Marathon Special Products CT3. Both are Class T fast acting fuses rated 300 VAC. The table lists all 33 ratings from 1 A to 1200 A, with the Mersen A3T and Littelfuse JLLN numbers on the same line. Every line is an exact amp-for-amp match.
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Bussmann JJN to Marathon CT3 cross reference
| Bussmann | Amps | Marathon | Mersen | Littelfuse |
|---|---|---|---|---|
| JJN-1 | 1 A | CT3-1 | A3T1 | JLLN001 |
| JJN-3 | 3 A | CT3-3 | A3T3 | JLLN003 |
| JJN-6 | 6 A | CT3-6 | A3T6 | JLLN006 |
| JJN-10 | 10 A | CT3-10 | A3T10 | JLLN010 |
| JJN-15 | 15 A | CT3-15 | A3T15 | JLLN015 |
| JJN-20 | 20 A | CT3-20 | A3T20 | JLLN020 |
| JJN-25 | 25 A | CT3-25 | A3T25 | JLLN025 |
| JJN-30 | 30 A | CT3-30 | A3T30 | JLLN030 |
| JJN-35 | 35 A | CT3-35 | A3T35 | JLLN035 |
| JJN-40 | 40 A | CT3-40 | A3T40 | JLLN040 |
| JJN-45 | 45 A | CT3-45 | A3T45 | JLLN045 |
| JJN-50 | 50 A | CT3-50 | A3T50 | JLLN050 |
| JJN-60 | 60 A | CT3-60 | A3T60 | JLLN060 |
| JJN-70 | 70 A | CT3-70 | A3T70 | JLLN070 |
| JJN-80 | 80 A | CT3-80 | A3T80 | JLLN080 |
| JJN-90 | 90 A | CT3-90 | A3T90 | JLLN090 |
| JJN-100 | 100 A | CT3-100 | A3T100 | JLLN100 |
| JJN-110 | 110 A | CT3-110 | A3T110 | JLLN110 |
| JJN-125 | 125 A | CT3-125 | A3T125 | JLLN125 |
| JJN-150 | 150 A | CT3-150 | A3T150 | JLLN150 |
| JJN-200 | 200 A | CT3-200 | A3T200 | JLLN200 |
| JJN-225 | 225 A | CT3-225 | A3T225 | JLLN225 |
| JJN-250 | 250 A | CT3-250 | A3T250 | JLLN250 |
| JJN-300 | 300 A | CT3-300 | A3T300 | JLLN300 |
| JJN-350 | 350 A | CT3-350 | A3T350 | JLLN350 |
| JJN-400 | 400 A | CT3-400 | A3T400 | JLLN400 |
| JJN-450 | 450 A | CT3-450 | A3T450 | JLLN450 |
| JJN-500 | 500 A | CT3-500 | A3T500 | JLLN500 |
| JJN-600 | 600 A | CT3-600 | A3T600 | JLLN600 |
| JJN-700 | 700 A | CT3-700 | A3T700 | JLLN700 |
| JJN-800 | 800 A | CT3-800 | A3T800 | JLLN800 |
| JJN-1000 | 1000 A | CT3-1000 | A3T1000 | JLLN1000 |
| JJN-1200 | 1200 A | CT3-1200 | A3T1200 | JLLN1200 |
All Marathon CT3 fuses on this page are Class T, fast acting, 300 VAC. Matching rule: same fuse class, same voltage, same operating type and the exact amp rating. No nearest-rating substitutions.
300 V or 600 V Class T?
Class T comes in two voltage ratings with different body lengths. CT3 is the 300 VAC fuse and crosses Bussmann JJN. CT6 is the 600 VAC fuse and crosses Bussmann JJS. Check the voltage on the print before you swap.
Common questions
What is the Marathon equivalent of Bussmann JJN-100?
Marathon Special Products CT3-100 is the Class T fast acting fuse at 100 A and 300 VAC. Mersen A3T100 and Littelfuse JLLN100 are the same rating.
What voltage is Marathon CT3?
CT3 is rated 300 VAC. The CT6 series is the 600 VAC Class T fuse that crosses Bussmann JJS.
Which Marathon fuse crosses Mersen A3T or Littelfuse JLLN?
The same CT3 catalog number. Match the amp rating: A3T400 and JLLN400 both cross to CT3-400.
What amp range does Marathon CT3 cover?
The CT3 ratings on this page run from 1 A to 1200 A, 33 ratings in all.
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 · Bussmann JKS to Marathon CJ-F · Bussmann KTK-R to Marathon CC-F · Marathon Special Products collection
Bussmann and JJN are trademarks of Eaton. Mersen and A3T are trademarks of Mersen. Littelfuse and JLLN 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.