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Utility fuses

Transformer protection devices

Eaton’s Cooper Power series Bay-O-Net fuse offers a protection package for single- and three-phase transformers. The assembly combines the ease of hotstick operation with the safety of deadfront construction and is used with an isolation link to prevent line personnel from closing into a fault when replacing a blown Bay-O-Net link. Eaton’s Cooper Power series MagneX Interrupter is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults, and is also used for switching the transformer “on” or “off.”

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ELSP current-limiting backup fuse catalog 38 kV Bay-O-Net fuse link catalog
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Hotstick-operable
Ease-of-use
Field-proven performance
Reliability
Isolation link
Improved safety

Core features

  • A Bay-O-Net fuse is ideal for use in a two-fuse protection scheme with a current-limiting backup fuse. In this arrangement, secondary faults and overload currents are cleared by the Bay-O-Net fuse, and high level faults are cleared by the current-limiting fuse. The two fuses are connected in series, and are coordinated so that the current-limiting fuse operates only upon internal equipment failure
  • Bay-O-Net fuse not used in-series with a current-limiting fuse require an isolation link
  • Bay-O-Net fuses are comparable in cost to internal cartridge fuses but have the advantages of being field-replaceable. Bay-O-Net fuses can easily be coordinated with upstream devices
  • An isolation link provides extra protection during refusing and switching operations when used in series with a Bay-O-Net type fuse or MagneX Interrupter
  • MagneX Interrupter is an integral assembly, which does not use a troublesome linkage or require calibration, making installation and operation fast and trouble-free
  • The oil-immersed current sensing weak link cartridge fuse is an internal, “weak link” expulsion fuse

Watch this short demonstration of transformer protection devices.

Superior protection with Bay-o-Net fuses

Eaton's Cooper Power series transformer protection options include the standard Bay-O-Net draw out fuse in a standard or flipper configuration, a full line of low-current fuse cartridges, as well as under-oil ELSP partial range current limiting fuses that make coordination simple.

Resettable protection with Magnex interrupters

Eaton's innovative Cooper Power series Magnex interrupter offers all-in-one resettable protection for either padmont or overhead transformer applications, eliminating the need to refuse apparatus.

TransFusion Coordination Program

This free, web-based, easy-to-use coordination tool makes transformer fuse selection effortless. By simply inputting a few pieces of data fields and selecting the desired level of protection, you can quickly find the right Eaton's Cooper Power series ELSP, MagneX Interrupter or Bay-O-Net fuses for your application. The TransFusion Coordination Program provides you the flexibility of trying various combinations before deciding on the one that best fits your application needs. A simple click of the print button allows you to print your TCC curves and part numbers.
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  • 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 302 KB , 12/31/2015)
  • 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 , 01/24/2023)
  • 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 , 07/25/2019)
  • 23 kV and 38 kV sidewall-mounted and 23 kV cover-mounted Bay-O-Net fuse assembly catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series Bay-O-Net fuse assemblies which protect transformer and distribution systems.
    (PDF 1 MB , 07/31/2015)
  • 38 kV Bay-O-Net fuse link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series 38 kV Bay-O-Net fuse link, which when used in Eaton's Cooper Power series 38 kV silver-plated Bay-O-Net assemblies, protects distribution apparatus from damaging currents and distribution systems from failed apparatus.
    (PDF 96 KB , 03/30/2019)
  • Bay-O-Net fuse assembly drip guard catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series drip guard for sidewall mount Bay-O-Net fuse assemblies which prevent dripping of oil or other insulating fluids onto molded rubber terminators, cables and arresters during removal of the bayonet fuse holder.
    (PDF 158 KB , 04/30/2015)
  • Current sensing Bay-O-Net fuse link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series current sensing Bay-O-Net fuse link that is used in Bay-O-Net fuse assemblies to protect distribution apparatus from damaging currents and distribution systems from failed apparatus.
    (PDF 261 KB , 02/28/2018)
  • Dual element Bay-O-Net fuse link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series dual element Bay-O-Net fuse link used in Bay-O-Net fuse assemblies which protect distribution apparatus from damaging currents and distribution systems from failed apparatus.
    (PDF 289 KB , 02/28/2018)
  • Dual sensing Bay-O-Net fuse link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series dual sensing Bay-O-Net fuse link used in Bay-O-Net fuse assemblies to protect distribution apparatus from damaging currents and distribution systems from failed apparatus.
    (PDF 266 KB , 02/28/2018)
  • EL Bay-O-Net current-limiting fuse assembly catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series EL Bay-O-Net fuse assembly which is used to mount the ELS current-limiting fuse in fluid-filled distribution apparatus.
    (PDF 507 KB , 10/31/2015)
  • 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 , 03/13/2024)
  • 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 , 02/28/2018)
  • ELSP fuse holder catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series ELSP fuse holder which is used to support ELSP oil-immersible current-limiting fuses, where the fuses are rated 23 kV and below.
    (PDF 223 KB , 12/31/2015)
  • High ampere overload Bay-O-Net fuse link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series high ampere overload Bay-O-Net fuse link which is found in Eaton's Cooper Power series silver-plated Bay-O-Net assemblies that protect distribution apparatus from damaging currents and distribution systems from failed apparatus.
    (PDF 156 KB , 02/28/2018)
  • Isolation link catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series isolation links which provide extra protection during refusing and switching operations when used in series with isolation links the Bay-O-Net type fuse or MagneX interrupter.
    (PDF 163 KB , 02/28/2018)
  • MagneX single-phase interrupter catalog
    This catalog provides features and ordering information for Eaton's Cooper Power series MagneX interrupter which is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults, and is also used for switching the transformer on or off.
    (PDF 803 KB , 07/31/2015)
  • Two- and three-phase MagneX interrupter catalog
    This catalog provides features and ordering information for Eaton’s Cooper Power series MagneX interrupter which is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults and is also used for switching the transformer on or off.
    (PDF 718 KB , 06/27/2025) Updated
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