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Protective Relay Companies

These companies offer protective relay devices for electrical systems, protecting them from overloads, short circuits, and other electrical faults.

Protective Relay Key Company


*Disclaimer: List of key companies in no particular order


Latest Company Updates:


October 2023- The PJM Board of Managers has permitted some adjustments to the Regional Transmission Expansion Plan (RTEP) to support in assuring the most dependable, cost-effective, and effectual supply of power for nearly 65 million people PJM caters across 13 states and the District of Columbia.


The PJM Board on Oct. 3 approved three reliability projects in total that will:


Adjust relay settings at the Riverton substation on the Riverton-Bethel Tap 138 kV line to mitigate issues related to the 2025 deactivation notice of Brandon Shores 1 and 2 coal units in the APS zone.


Remove the 345 kV and 230 kV generator lead lines at the recently deactivated, coal-fired Homer City Generating Station. Install new station service supply and separate AC station service, separate protection and control schemes, and review and adjust relay protection settings.


Install a series reactor at the Springdale substation on the Cheswick-Springdale 138 kV line in the APS zone.


Baseline reliability transmission enhancement costs are allocated to PJM load.


August 2023- Siemens has introduced the latest generation of line monitoring relays. The SIRIUS 3UG5 line monitoring relay features demonstrated the technology with the latest applications and functions. The relays are the simplest manner to observe standards-compliant grid stability and quality, making sure the right system operation and long service life of components such as motors or compressors. Grid monitoring relays are highly being implemented in crucial places like hospitals where high-quality, power supply is required.


Top listed global companies in the industry are:



  • Hitachi ABB Power Grids

  • Schneider Electric

  • Siemens AG

  • Eaton

  • Mitsubishi Electric

  • Toshiba Corporation

  • SEG Electronics GmbH

  • Fuji Electric Co. Ltd

  • Littelfuse Inc.

  • WEG

  • TE Connectivity Ltd.

  • Basler Electric

  • Rockwell Automation Inc.

  • Woodward Inc.

  • CIRCUTOR SA

  • PBSI Group

  • Orion Italia s.r.l

  • Schweitzer Engineering Laboratories

  • General Electric, and others.

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