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Utility fuses

Power fuses

Eaton’s Cooper Power series fuses are available in a range of kV and amp ratings for protection of transformers and other electrical apparatus. Boric acid, expulsion-style fuses are suitable for both indoor and outdoor applications and provide an economical alternative to refillable fuses. Cooper Power series general purpose power fuses are full-range fuses that provide consistent clearing of low currents as well as reliable, high-speed interruption of high magnitude short-circuit currents. The under-oil fuses are designed to operate in fluid-filled distribution apparatus.

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Field-proven performance
Reliability
Expulsion-style
Economical
Variety of speeds
Fits most applications

Core features

  • The "E" rated fuses have time-current characteristics that coordinate easily with other upstream and downstream protective devices
  • The CMU power fuse interrupts at a natural current zero in the current wave and allows a minimum of a half cycle of fault current to flow before the fault is cleared. The time-current characteristics associated with a CMU power fuse have a gradual slope, making it easier to coordinate with downstream equipment
  • The CMU power fuse is ideal for higher voltage (up to 38 kV) and high current applications (through 200 A). Proper coordination can be achieved through use of the appropriate time-current curves
  • The ELG current limiting power fuse fits in a standard power fuse mountings and are suitable for indoor and outdoor fuse installations
  • The CMU power fuse is offered in three configuration for use with high currents: “E” (standard), “K” (fast) and “SE” (slow). The curves for the “SE” are less inverse and allow for a greater time delay at high currents
  • ELSG fuses have been tested and meet all the requirements set forth in IEEE Std C37.40, Std C37.41 and IEEE Std C37.46 standards
  • ELSG fuses have been tested and meet all requirements set forth in IEEE Std C37.40, Std C37.41 and IEEE Std C37.46 standards         

Ultimate protection with CMU power fuses

Cooper Power series CMU power fuses provide ultimate protection from 17 through 38 kV. These Cal fire-compliant fuses come in three speeds and K, E and SE ratings to meet every application.

Field-proven reliability in every fuse

The CMU fuses have field-proven technology built for years of reliable service. The CMU fuse can be used in most OEM or replacement applications regardless of the holder manufacturer.
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)
  • 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)
  • 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)
  • CMU medium voltage power fuses catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series CMU power fuse which is a boric acid, expulsion-style fuse suitable for both indoor and outdoor applications and is available in three maximum voltage classes: 17 kV, 27 kV and 38 kV.
    (PDF 877 KB , 26/09/2019)
  • 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 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)
  • 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)
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