Best Fuse Cross-Reference Resources

About this list

This is a list of resources, not a ranking of companies. DENCO's own page comes first because this is DENCO's site. Each third-party tool below was loaded on 22 September 2026, and we describe only what its own page says it does. None of these tools claims to cover DENCO part numbers, and we do not suggest that it does.

Several of the tools are built mainly around low-voltage UL fuse classes. Where a resource says it covers medium voltage fuses, we say so; where it does not, we don't assume it.

1. DENCO Fuses: published equivalences plus engineering review

In short: Medium voltage and legacy parts where you want a manufacturer to review the installation, not just match a number

DENCO's cross-reference page does two jobs. First, it lists the equivalences DENCO's own catalog publishes, quoted without alteration: GE CLF and Cooper ELSP to DENCO DCLF; Cooper CBUC.., Hi-Tech HTSS.. and Mersen 9F59CCF.. to DENCO DEFTH; and G.E. 9F60 Series to DENCO E-Rated Type EJ-1. Second, it is an intake form for every other part number, including obsolete and discontinued fuses no longer supported by their original maker.

The page is explicit about limits: a cross-reference from DENCO is a candidate for review, not a guarantee of interchangeability. Electrical ratings, physical fit, applicable standards and the protected application are assessed by DENCO engineering before any substitution is confirmed. If your part is not in the table, send the part number and DENCO engineering will confirm what it can supply.

• Six published equivalences, all quoted from DENCO's catalog
• Asks for part number, voltage (AC or DC), current, interrupting rating, dimensions, indicator needs, required standard and a photo
• 30-day lead time on all DENCO products
• Toll-free 1-800-305-FUSE (3873)

See the DENCO range

2. Eaton Bussmann series: competitor cross reference search

In short: Finding the closest Bussmann series catalog number for a competitor part number

Eaton's search engine takes a competitor part number and returns the Bussmann series catalog numbers it considers the closest equivalent, along with packaging variants. The tool states that its suggestions "represent the closest Eaton's Bussmann Business equivalent based upon the entered competitive part number" and that it is the user's responsibility to review the product specifications for suitability.

The page points users to Eaton's application engineering team for questions and to a distributor locator for sourcing. It is a Bussmann-to-competitor tool; it does not return DENCO parts.

Eaton Bussmann series competitor cross reference website

3. Eaton Bussmann series: parametric fuse selector

In short: Searching Bussmann series fuses by attribute when you know the ratings but not a part number

Where the cross reference tool starts from a part number, the selector starts from ratings. Eaton says these tools aid selection of Bussmann series branch circuit, supplemental and photovoltaic fuses, and medium voltage fuses, and that results can be narrowed by choosing several attributes at once.

This is useful when the original marking is worn off but you have the equipment data: voltage class, current, and the application. The same responsibility note applies: check the specifications before you substitute.

Bussmann series fuse selector tools website

4. Mersen: online cross reference

In short: Finding a Mersen equivalent for a competitor part number

Mersen's tool takes competitive part numbers and returns "the closest Mersen's equivalent based on form and function." Its disclaimer puts the check on the user: it is the user's responsibility to review the detailed product specifications to determine suitability for the intended application or use.

Mersen also catalogs the 9F60 series today (for example part 9F60FJE100 on mersen.com), which is why buyers holding an older G.E. 9F60 fuse often search under both names.

Mersen cross reference website

5. Mersen: Amp-Trap 2000 cross reference and upgrade chart (PDF)

In short: A printable low-voltage reference for maintenance crews

This one-page chart lists existing Mersen and competitor part numbers alphabetically by UL class (RK1 250 V and 600 V, J, L and CC) with the Mersen part to "upgrade to". The chart itself says it is a consolidated list of the most common parts and directs users to Mersen's online database for anything more.

It is a low-voltage resource. It is useful in a plant where the same crew maintains both the medium voltage switchgear and the low-voltage distribution downstream of it.

Mersen printed cross-reference and upgrade charts website

6. Littelfuse: medium voltage cross reference guide (download)

In short: Checking Littelfuse medium voltage stock against a competitor type

Littelfuse publishes a medium voltage guide that, in its own words, covers "the most popular medium voltage fuse types that Littelfuse has in stock and ready to ship within the continental United States." The download sits behind a short form.

Littelfuse also runs a general competitor cross reference at littelfuse.com. That page returned a bot-protection block when we tried to load it, so we don't describe its contents here.

Littelfuse Medium Voltage Fuse Cross Reference Guide website

7. FIC Corp: multi-brand low-voltage cross reference

In short: Comparing several brands side by side within a UL fuse class

FIC's page lists similar fuses from Bussmann, Littelfuse, Mersen, FIC, Schurter and other brands by UL class, voltage and fast or time-delay characteristic, with compatible fuse blocks, holders and reducers. Its disclaimer is worth quoting because it applies to every tool on this list: "The watch word is similar, and not necessarily identical."

FIC Corp cross reference website

8. Primary evidence: markings, nameplate and renewal-parts list

In short: Confirming what the equipment was designed to take before you trust any match

A cross-reference is only as good as the part number you feed it. Read the full marking on the fuse (maker, series, voltage, current or E, R or C rating, interrupting rating) and compare it with the switchgear, starter or transformer nameplate and the equipment maker's renewal-parts list. If the fuse has been replaced before, the one in the clips may not be what the equipment maker specified.

Photograph the fuse in its mounting and measure overall length, diameter and ferrule or bolt-hole dimensions. A photo resolves most questions immediately, which is why DENCO's intake form asks for one.

See the DENCO range

9. Manufacturer datasheets and time-current curves

In short: Checking that a proposed replacement behaves like the original, not just fits

Two fuses with the same voltage and current rating can have different melting curves, let-through current and I2t. Once a tool suggests a candidate, get both makers' datasheets and time-current curves and compare them against the upstream and downstream devices. That comparison belongs in a coordination review, not in a search box.

Standard rating definitions help you read the datasheets. Under ANSI/IEEE C37.46, an E-rated fuse of 100 A or less melts in 300 seconds at 200 to 240 percent of its rating, and above 100 A melts in 600 seconds at 220 to 264 percent. An R-rated fuse melts in 15 to 35 seconds at 100 times the R number. ANSI C37.40 defines expulsion and current-limiting fuses and the full-range, general-purpose and back-up classes.

See the DENCO range

Brand names change; part numbers stay

Many of the fuses in service were bought under names that have since changed hands. Eaton completed its acquisition of Cooper Industries in December 2012, and Cooper Bussmann products are now sold as Eaton's Bussmann series. The G.E. 9F60 series is now cataloged by Mersen. When a tool returns nothing, try the part under the current owner's name, and keep the original marking in your records so the history is traceable.

How to use any cross-reference safely

Every tool on this list carries a disclaimer, and they all say the same thing in different words. Treat the result as a candidate and check it.

• Match voltage class and system type (AC or DC) first; a fuse applied above its rated voltage may fail to interrupt
• Check interrupting rating against the available fault current at that point in the system
• Compare the rating type (E, R, C or a general current rating) and the time-current curve, not just the amp number
• Confirm physical fit: length, diameter, ferrule or bolt pattern, and any indicator or microswitch
• Confirm the standard or approval the installation must meet
• Ask the replacement maker to review the application before you order

Frequently asked questions