Best Medium Voltage Fuse Manufacturers (2026)
DENCO Fuses publishes this list and ranks itself first. The other entries are real manufacturers whose own websites we checked in September 2026; each description sticks to what those sites say, and the order after DENCO is not a quality ranking.
The main medium voltage fuse manufacturers in 2026 include DENCO Fuses, Eaton (Bussmann and Cooper Power series), Mersen, S&C Electric, ABB (Hi-Tech), SIBA, Littelfuse, Hubbell Power Systems (Chance) and ETI. The right choice depends on the fuse family you need (E-rated, R-rated, PT, backup or full-range current-limiting), the standard your equipment follows, and how quickly you need parts.
How this list was put together
We started from the fuse families a medium voltage buyer actually specifies: E-rated fuses for transformers and feeders, R-rated fuses for motor starters, potential transformer (PT) fuses, and backup or full-range current-limiting fuses for utility distribution. A company made the list only if its own website shows at least one of those families.
For every company we loaded its website in September 2026 and kept only claims that page supports. Where a claim could not be confirmed on the manufacturer's own site, we left it out. Voltage ranges and ratings for other companies are quoted from their pages; check the current data sheet before you specify anything.
DENCO is first because this is DENCO's site. After DENCO, entries are grouped roughly by how broad their medium voltage range is, not by quality.
1. DENCO Fuses, Miami, Florida
Best for: Buyers who need a broad medium voltage range, cross-reference replacements and a 30-day lead time
DENCO Fuses, Inc. is a Miami, Florida company, incorporated in Florida in 1988 as DenMar Transit Engineering (later DenMar Fuses). The team brings over 100 years of combined experience, solely in manufacturing electrical fuses. DENCO fuses are manufactured in an ISO 9001:2015 certified facility, tested in-house at DENCO's factory lab, and can be sent for third-party testing at IPH Berlin (Germany) on client request.
The medium voltage range covers E-rated transformer protection fuses (9F60/EJ-1, 9F62/EJO-1 and Clip Lock 14 series, with or without trip indicator or microswitch), R-rated motor and soft-starter fuses in single, double and triple barrel, PT fuses for potential transformer primaries, C-rated capacitor fuses, DHS/DHHS current-limiting dropout fuses, 25 kV class loadbreak elbow fuses, Bay-O-Net holders and links with oil-submersible current-limiting backup fuses, and Type HH (DIN-style) HV HRC fuse-links.
Lead time is 30 days on all products, where the industry norm is commonly longer. DENCO serves utilities and power companies, OEM and specialty custom design customers, electrical contractors and transit.
- 30-day lead time on all products
- Published cross-references include GE 9F60 Series to DENCO E-Rated Type EJ-1 and GE CLF to DENCO DCLF
- Direct engineering contact: 1-800-305-FUSE (3873) or (305) 273-6226
2. Eaton: Bussmann series and Cooper Power series
Best for: Industrial E-rated and R-rated fuses plus utility transformer fusing under one supplier
Eaton sells medium voltage fuses under two names. The Bussmann series covers ANSI/IEEE E-rated fuses, which Eaton describes as general purpose and full range current-limiting fuses for feeder circuit, switchgear and transformer protection, in ferrule, bolt-on and clip lock construction, with data sheets at 2.75, 5.5, 8.3 and 15.5 kV. Its R-rated fuses are backup current-limiting fuses typically used to protect medium voltage drives and starters.
The Cooper Power series serves utility transformers: Bay-O-Net fuse assemblies for single- and three-phase transformers, and ELSP current-limiting backup fuses used in series with a Bay-O-Net link in a two-fuse protection scheme.
- E-rated in ferrule, bolt-on and clip lock construction
- R-rated backup fuses for drives and starters
- Bay-O-Net and ELSP for pad-mounted transformers
3. Mersen
Best for: A single catalog spanning E-rated, R-rated, PT and oil-submerged current-limiting fuses
Mersen's US site lists five medium voltage families: E Rated general purpose fuses, R Rated back-up fuses, ETP external transformer protection fuses, potential transformer fuses (listed at .625 kV to 15.5 kV) and Oil-Submerged Protection (OSP) current-limiting fuses. Its US fuse sales office is in Newburyport, Massachusetts.
4. S&C Electric Company, Chicago, Illinois
Best for: Utility substation and distribution power fuses
S&C says it invented the Liquid Power Fuse over 100 years ago. Its current fuse range includes SMD power fuses for outdoor distribution (protecting transformers, capacitors and cables in substations) and outdoor transmission, SM and SML power fuses, the Fault Tamer fuse limiter, which combines a fuse cutout with a backup current-limiting fuse for 15 kV through 25 kV systems, Positrol fuse links and the Type XS fuse cutout. S&C has been 100% employee share-owned since 2012.
5. ABB Hi-Tech current-limiting fuses
Best for: Utility backup and full-range current-limiting fuses for overhead and pad-mounted equipment
ABB's Hi-Tech brand covers backup current-limiting fuses (OS series for overhead distribution, EXT series for wet-well holders in oil-filled pad-mounted switchgear and transformers) and full-range current-limiting fuses (FX, EX and SX series), plus the Hi-Tech Valiant full-range fuse aimed at fire mitigation. ABB states that Hi-Tech fuses are manufactured in Hickory, North Carolina, and offers the Hi-Tech FACT tool for backup fuse coordination.
6. SIBA, Lunen, Germany
Best for: IEC and DIN-style HH fuse-links for transformers, motors, capacitors and voltage transformers
SIBA was founded in 1946 in Lunen, Germany, and says it has developed and manufactured only fuse-links since then. Its HH high-voltage fuse-links reference IEC 60282-1, IEC 60644 (motor circuits), IEC 60549 (capacitors) and DIN 43625 (rated voltage 3.6 to 36 kV), with versions for distribution transformers, motors, capacitors and voltage transformers in air-insulated, gas-insulated and oil-insulated equipment.
7. Littelfuse, Rosemont, Illinois
Best for: Industrial E-rated, R-rated and PT fuses with matching clips
Littelfuse manufactures general-purpose E-rated fuses, backup R-rated fuses and PT fuses, along with a line of fuse clips. Its medium voltage page lists ratings of 600 to 8,250 V ac, indicator pins on E-rated and R-rated fuses, encapsulated and sealed versions for hazardous areas, and single-, double- and triple-barrel configurations in bolt-down and clip lock styles.
8. Hubbell Power Systems: Chance brand
Best for: Overhead distribution fuse links, cutouts and power fuses
Hubbell's Chance brand, founded in 1907 and acquired by Hubbell in 1994, supplies cutouts and fuse links for utility overhead lines, including Type K, Type T, Type MS and SloFast links. Chance HMD power fuse mountings paired with HMU power fuse units cover applications beyond the reach of expulsion-style cutouts.
9. ETI Elektroelement, Izlake, Slovenia
Best for: IEC backup HV fuse-links for ring-main units and SF6 switchgear
ETI's VV high-voltage current-limiting fuse-links protect distribution transformers, power capacitors and MV motors in switchgear. ETI's data sheet gives time-current characteristics per IEC 60282-1 (back-up fuse), lists suitability for indoor and outdoor ring-main units and SF6-insulated enclosures, and notes that non-standard dimensions can be supplied on request.
How to choose a medium voltage fuse manufacturer
Start with the fuse family, not the brand. The type of equipment you are protecting decides which family you need, and each family is defined by a standard rather than by one maker's catalog.
- Transformers and feeders: E-rated current-limiting fuses. Under IEEE C37.46, an E-rated fuse of 100 A or less melts in 300 seconds at 200 to 240% of its rating.
- Medium voltage motor starters: R-rated backup fuses, which melt in 15 to 35 seconds at 100 times the R number. They are paired with an overload relay because they do not protect against light overloads.
- Potential transformers: PT fuses for the primary side.
- Utility overhead and pad-mounted gear: expulsion fuse links, backup current-limiting fuses, or full-range current-limiting fuses, depending on the coordination scheme.
- IEC and DIN equipment: HH (DIN 43625 style) fuse-links built to IEC 60282-1.
Questions to ask before you order
Once the family is clear, compare suppliers on what affects your outage or build schedule: lead time on the exact part number, whether the fuse is a drop-in replacement for the one in service (dimensions, mounting and time-current curve), what test documentation comes with it, and whether you can reach an engineer who will confirm a cross-reference before you buy.
If you are replacing an installed fuse, send the full part number from the old fuse label. DENCO's published cross-references cover GE CLF, Cooper ELSP, Cooper CBUC, Hi-Tech HTSS, Mersen 9F59CCF and GE 9F60 series parts. For anything else, send the part number and DENCO engineering will confirm.
Frequently asked questions
What is the difference between E-rated and R-rated fuses?
E-rated fuses are general-purpose or full-range current-limiting fuses used mainly for transformers and feeders. R-rated fuses are backup fuses for medium voltage motor circuits and are always used with an overload relay, because they only clear high fault currents.
Which standards cover medium voltage fuses?
In North America, the IEEE/ANSI C37 series (including C37.40 for definitions and C37.46 for power fuse ratings) covers most medium voltage fuses. IEC 60282-1 is the main international standard for current-limiting high-voltage fuses, and DIN 43625 sets the dimensions of DIN-style HH fuse-links.
Can one manufacturer's fuse replace another's?
Sometimes, if the rating, dimensions, mounting and time-current characteristic match. Always confirm a replacement against the equipment manufacturer's data. DENCO publishes six cross-references and will confirm others when you send the part number.
How long does it take to get medium voltage fuses?
DENCO's lead time is 30 days on all products. Lead times across the industry are commonly longer, so ask every supplier for a lead time on the specific part number.
Limits of this article
- Fuse selection must be confirmed against the equipment manufacturer's data and a protection coordination study by a qualified engineer.
- Ratings and product families for other manufacturers are quoted from their websites in September 2026 and can change; check the current data sheet before specifying.
- Replacing fuses near energized equipment requires qualified personnel, NFPA 70E PPE and lockout/tagout.
- This list is not a performance test. Inclusion and order do not rate the quality of any manufacturer's product.
Related
- E-rated transformer protection fuses
- R-rated motor fuses
- Fuse cross-reference
- Medium voltage fuse selection guide
- Best Current-Limiting Fuse Suppliers for Utilities