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Utility fuses

Current-limiting fuses

Eaton’s Cooper Power series current-limiting fuses provide overload protection for all overhead, indoor and underground cable distribution systems and are used for transformer protection, capacitor protection and sectionalising. They have become integral parts of many distribution systems because of their desirable characteristics of noiseless interruption, no expulsion violence, current-limiting action and very high current-interrupting capability.  

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No expulsion design
Improved safety
High current interruption
Better equipment protection
Current limiting capability
Extends service life

Core features

  • Wide variety of mounting options to meet application needs
  • Full range and partial range current-limiting fuse options
  • The current limit fuse operates silently, unlike expulsion fuses
  • The expulsive shower that exists with an expulsion fuse operation is eliminated, offering increased safety to line personnel during circuit energization operations and a wild fire mitigation option for utilities
  • Cutout-mounted options with the reliable drop-open design makes locating the fault easy

Easily retrofit industry-standard interchangeable cut-outs

Eaton’s Cooper Power series ELF current-limiting drop-out fuse is a full range, current-limiting fuse, designed for mounting in an industry-standard interchangeable cut-out that is presently used for expulsion fuses. The ELF fuse is Cal Fire compliant and designed to be used to protect pole-type transformers, single-phase and three-phase laterals and underground taps.

Easily retrofit industry-standard interchangeable cutouts

Eaton’s Cooper Power series ELF current-limiting dropout fuse is a full-range current-limiting fuse designed for mounting in an industry-standard interchangeable cutout that is presently used for expulsion fuses. The ELF fuse is Cal Fire-compliant and designed to be used to protect pole-type transformers, single-phase and three-phase laterals and underground taps.

Improved overload protection with fused loadbreak elbow connector

Cooper Power series fused loadbreak elbow connector current-limiting fuse is designed specifically for use in 15 and 25 kV class fused loadbreak elbow connector.

Protection and sectionalising from X-Limiter current-limiting fuses

Cooper Power series X-Limiter full-range current-limiting fuses are used for transformer protection, capacitor protection and sectionalising. Their non-gas evolving element design allows for maximum energy limitation and minimum peak arc voltages without corrosive by-products, significantly limiting the electrical and mechanical stresses on the protected equipment. The X-Limiter is Cal Fire-compliant and tested to meet ANSI/IEEE Standard design requirements for power fuses as well as distribution class fuses.

Extend equipment life with Type NX current-limiting fuses

Cooper Power series Type NX current-limiting fuses provide overload protection for all indoor and underground cable distribution systems 2.4 through 34.5 kV. NX fuses are noiseless and do not expel hot gases or burning particles while interrupting currents from minimum melt to maximum fuse rating (50,000 A through 23 kV, 35,000 A through 27 and 38 kV). Their current-limiting capability greatly reduces the momentary duty on protected equipment, extending the life and, in some cases, reducing the original cost of that equipment. The ability of an NX fuse to interrupt low-current faults eliminates the need for auxiliary devices to handle these troublesome current levels. An NX fuse extends system coordination because it is fast clearing and current-limiting – conductor and equipment damage caused by high currents is virtually eliminated.
Specifications

SKU-Level data coming soon!

Complete product technical specifications and catalogue number information, along with other related downloads, can be accessed in the resources section of this page.

Download Links
  • 200 and 600 A molded rubber product application sheets
    This document contains Eaton's Cooper Power series 200 and 600 A molded rubber product application sheets
    (PDF 315 KB , 07/07/2025) Updated
  • Commercial and industrial medium-voltage electrical distribution products brochure
    This brochure outlines Eaton’s Cooper Power series broad commercial and industrial medium-voltage transformer, switchgear, fuse, sectionalizer, switch, regulator, tool, OEM equipment, cable accessory, lightning arrester, power capacitor and recloser offerings.
    (PDF 2 MB , 24/01/2023)
  • Current-limiting dropout ELF fuse product aid
    This brochure outlines Eaton’s Cooper Power series ELF fuse, a full range, current-limiting dropout fuse with a self-contained design that eliminates noise and expulsive showers associated with expulsion fuse operation, making it suitable for use in areas where a high fire hazard exists.
    (PDF 266 KB , 30/09/2018)
  • Storm season rapid response information
    Eaton’s Cooper Power series product team works together with the engineering services team to provide a full storm response procedure to quickly ramp up operations in anticipation of storm impact for fast product shipment and remediation of damaged apparatus during storm recovery.
    (PDF 619 KB , 25/07/2019)
  • 15, 25 and 28 kV class fused loadbreak elbow current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series fused loadbreak elbow connector current-limiting fuses which are designed specifically for use in 15, 25 and 28 kV class fused loadbreak elbow connectors.
    (PDF 185 KB , 31/10/2015)
  • Companion II and Hi-Amp Companion II back-up current-limiting fuses
    This catalog provides features and ordering information for Companion II and Hi-Amp Companion II back-up current-limiting fuses
    (PDF 332 KB , 25/10/2024)
  • Current-limiting fuse mounts catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series current-limiting fuse mountings which provide overload protection for all indoor and underground cable distribution systems.
    (PDF 453 KB , 31/10/2018)
  • Direct-connected capacitor fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series X-Limiter fuse which, when used as a direct-connected capacitor fuse (particularly for indoor and/or enclosed banks), provides a full-range current-limiting fuse requiring a minimum of mounting space for a smaller low cost package.
    (PDF 392 KB , 31/10/2015)
  • Edison modular fuse, vault application products catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series Edison modular fuses (EMF) which are fully shielded and insulated in-line fuses for use in dead front, overhead or underground, submersible cable distribution systems.
    (PDF 743 KB , 30/04/2015)
  • ELF current-limiting dropout fuse catalog
    This catalog provides ratings, dimensions and ordering information regarding Eaton's Cooper Power series ELF dropout fuse, a full range current-limiting fuse designed for mounting in an industry-standard interchangeable cutout that is presently used for expulsion fuses.
    (PDF 513 KB , 27/05/2025)
  • ELF-LR current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series ELF-LR fuse which is a full range current-limiting fuse that is suitable for use in areas where a high-fire hazard exists.
    (PDF 292 KB , 31/10/2015)
  • ELS full-range current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series ELS full-range current-limiting fuses which are designed especially for use with EL Bay-O-Net fuse holders.
    (PDF 150 KB , 31/10/2015)
  • ELSG full-range current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series ELSG full-range current-limiting fuse which is for use in pad-mounted switchgear filled with Envirotemp FR3 fluid, mineral oil or approved equivalent.
    (PDF 1 MB , 25/02/2021)
  • ELSG fuse holder catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series ELSG current-limiting fuses which are mounted in the oil-filled distribution apparatus ELSG fuse holder, a non-loadbreak device.
    (PDF 133 KB , 29/03/2015)
  • ELSP current-limiting backup fuse catalog
    This catalog provides ratings, dimensions and ordering information for Eaton’s Cooper Power series ELSP current-limiting backup fuse which is used in series with low current primary protection devices such as a Bay-O-Net fuse or MagneX interrupter.
    (PDF 449 KB , 13/03/2024)
  • ELSP current-limiting backup fuse outgoing part number catalog
    The information in this catalog pertains to Eaton’s outgoing Cooper Power series ELSP part numbers; refer to catalog section CA132013EN for the most recent ELSP part numbers and technical data.
    (PDF 616 KB , 28/02/2018)
  • ELX full-range current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series ELX fuse which is a full-range current-limiting fuse designed to provide overcurrent protection; it is completely interchangeable with similar fuses using industry standard clip-style and dry well canister mountings.
    (PDF 198 KB , 21/03/2023)
  • JOE E-rated current-limiting power fuses catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series JOE current-limiting power fuses which are E-Rated per IEEE Std C37.46 standard, providing an excellent choice for protection of transformers, feeder circuits, high voltage switchgear and metal-enclosed switchgear.
    (PDF 1 MB , 31/10/2015)
  • K-Limiter high ampere Companion II fuse
    This catalog provides features and ordering information for Eaton's Cooper Power series K-Limiter fuse which may be conveniently applied as an add-on, backup, current-limiting fuse and as an extension of the NX Companion II fuse.
    (PDF 572 KB , 30/06/2018)
  • NX current-limiting fault guard tool catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series NX fault guard tool which can be applied anywhere that it is desirable to provide temporary current limitation when energizing a load.
    (PDF 407 KB , 30/11/2015)
  • NX indoor current-limiting fuses catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series NX current-limiting fuses which provide overload protection for all indoor and underground cable distribution systems 2.4 through 34.5 kV.
    (PDF 327 KB , 30/11/2020)
  • NXC full-range current-limiting capacitor fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series NXC outdoor, current-limiting capacitor fuse which allows for safe fusing of at least 50,000 joules of parallel connected energy.
    (PDF 275 KB , 08/02/2019)
  • Tandem ELF current-cimiting dropout fuse
    This catalog provides application and ordering information for Eaton’s Cooper Power series tandem ELF current‑limiting fuse which combines the features of a series fuse link and a backup current‑limiting fuse and can be applied for fusing single‑phase and three‑phase transformers (or three‑phase banks of single‑phase transformers).
    (PDF 235 KB , 21/02/2025)
  • X-Limiter full-range current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series X-Limiter full-range current-limiting fuses which are used for transformer protection, capacitor protection and sectionalizing.
    (PDF 329 KB , 19/12/2019)
  • X-Limiter hinge-mounted current-limiting fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series X-Limiter hinge-mounted full-range, current-limiting fuses which are to be used indoors or for metal clad applications, and outdoors for crossarm mounting or substation mounting for specific S&C Electric Company mountings.
    (PDF 451 KB , 25/10/2024)
  • X-Limiter unitized fuse catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series X-Limiter unitized fuse which allows paralleling two-inch diameter 15.5 kV fuses to fit NX code 2 hinge mountings and provides double current rated fused switching when a loadbreak feature is not required.
    (PDF 513 KB , 31/07/2015)
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