Bussmann LPJ-SP crosses to Marathon Special Products CJ-T. Both are Class J time delay fuses rated 600 VAC. The table below lists all 30 ratings from 1 A to 600 A, with the Mersen AJT and Littelfuse JTD numbers on the same line. Every line is an exact amp-for-amp match.
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Bussmann LPJ to Marathon CJ-T cross reference
| Bussmann | Amps | Marathon | Mersen | Littelfuse |
|---|---|---|---|---|
| LPJ-1SP | 1 A | CJ-T1 | AJT1 | JTD001 |
| LPJ-3SP | 3 A | CJ-T3 | AJT3 | JTD003 |
| LPJ-6SP | 6 A | CJ-T6 | AJT6 | JTD006 |
| LPJ-10SP | 10 A | CJ-T10 | AJT10 | JTD010 |
| LPJ-15SP | 15 A | CJ-T15 | AJT15 | JTD015 |
| LPJ-20SP | 20 A | CJ-T20 | AJT20 | JTD020 |
| LPJ-25SP | 25 A | CJ-T25 | AJT25 | JTD025 |
| LPJ-30SP | 30 A | CJ-T30 | AJT30 | JTD030 |
| LPJ-35SP | 35 A | CJ-T35 | AJT35 | JTD035 |
| LPJ-40SP | 40 A | CJ-T40 | AJT40 | JTD040 |
| LPJ-45SP | 45 A | CJ-T45 | AJT45 | JTD045 |
| LPJ-50SP | 50 A | CJ-T50 | AJT50 | JTD050 |
| LPJ-60SP | 60 A | CJ-T60 | AJT60 | JTD060 |
| LPJ-70SP | 70 A | CJ-T70 | AJT70 | JTD070 |
| LPJ-80SP | 80 A | CJ-T80 | AJT80 | JTD080 |
| LPJ-90SP | 90 A | CJ-T90 | AJT90 | JTD090 |
| LPJ-100SP | 100 A | CJ-T100 | AJT100 | JTD100 |
| LPJ-110SP | 110 A | CJ-T110 | AJT110 | JTD110 |
| LPJ-125SP | 125 A | CJ-T125 | AJT125 | JTD125 |
| LPJ-150SP | 150 A | CJ-T150 | AJT150 | JTD150 |
| LPJ-175SP | 175 A | CJ-T175 | AJT175 | JTD175 |
| LPJ-200SP | 200 A | CJ-T200 | AJT200 | JTD200 |
| LPJ-225SP | 225 A | CJ-T225 | AJT225 | JTD225 |
| LPJ-250SP | 250 A | CJ-T250 | AJT250 | JTD250 |
| LPJ-300SP | 300 A | CJ-T300 | AJT300 | JTD300 |
| LPJ-350SP | 350 A | CJ-T350 | AJT350 | JTD350 |
| LPJ-400SP | 400 A | CJ-T400 | AJT400 | JTD400 |
| LPJ-450SP | 450 A | CJ-T450 | AJT450 | JTD450 |
| LPJ-500SP | 500 A | CJ-T500 | AJT500 | JTD500 |
| LPJ-600SP | 600 A | CJ-T600 | AJT600 | JTD600 |
All 30 Marathon CJ-T fuses are Class J, time delay, 600 VAC. Matching rule: same fuse class, same voltage, same time delay type and the exact amp rating. No nearest-rating substitutions.
Time delay or fast acting?
LPJ, AJT, JTD and CJ-T are time delay fuses. They ride through motor and transformer inrush. If your print calls for a fast acting Class J fuse such as Bussmann JKS, Mersen A4J or Littelfuse JLS, the Marathon match is the CJ-F series, not CJ-T. Send the part number and we will confirm which one you need.
Fuse holders for Class J
Marathon Special Products also builds the Class J holders: open reinforced holders such as R6J30A3B and DIN rail enclosed holders such as 6SJ30A3IC, from 30 A to 400 A. See the Marathon Special Products collection or the MSP Class J fused disconnect switches.
Common questions
What is the Marathon equivalent of Bussmann LPJ-30SP?
Marathon Special Products CJ-T30 is the Class J time delay fuse at 30 A and 600 VAC. Mersen AJT30 and Littelfuse JTD030 are the same rating.
Is Marathon CJ-T a time delay Class J fuse?
Yes. The CJ-T series is Marathon Special Products' Class J time delay fuse, rated 600 VAC, from 1 A to 600 A. The CJ-F series is the fast acting Class J fuse.
Will a Marathon CJ-T fit my Bussmann Class J fuse holder?
Class J fuses are built to UL 248-8 dimensions for each amp range, so a CJ-T fits any Class J holder sized for the same amp range. Check the holder rating before you swap.
Which Marathon fuse crosses Littelfuse JTD or Mersen AJT?
The same CJ-T catalog number. Match the amp rating: JTD030 and AJT30 both cross to CJ-T30. Every rating in this table is an exact documented match, with no nearest-size substitutions.
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 a fuse and holder package for a panel? Book a time and we will go through the application.
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More cross references: all cross references · Marathon for data centers and BESS · control transformers by kVA
Bussmann and LPJ are trademarks of Eaton. Mersen and AJT are trademarks of Mersen. Littelfuse and JTD 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.