Nuclear Solutions

Modernize and upgrade the critical electrical systems that protect and control nuclear facilities with advanced digital relays qualified for safety-related applications.

SEL maintains exclusive partnerships with two of the nuclear power industry’s most trusted companies—Framatome and Curtiss-Wright Nuclear—who are authorized to qualify and support our products for safety-related nuclear applications.

The SEL partnership with Framatome and Curtiss-Wright marks a step-change in the nuclear power industry. Now, for the first time in the 40+ years that digital protective relays have been on the market, a full line of intelligent electronic devices is available for safety-related applications.  

Our partners have long track records of implementing industry standards and guidance, as well as navigating the regulatory requirements for evaluating and dedicating digital relays. Each has devoted significant effort to testing and documenting SEL products to verify that they meet the rigorous requirements of the nuclear industry.

Comprehensive Protection and Control Solutions

Framatome and Curtiss-Wright Nuclear qualify SEL devices for safety related nuclear applications in these areas and more:

  • Differential protection
  • Feeder protection
  • Generator protection
  • Motor protection
  • Transformer protection

See Our Partners’ Solutions

Contact Our Partners

If you’re planning a modernization project or considering your options, contact one of our partners.

Each of our partners has the same access to SEL products and technologies and works closely with us on technical support and service. Choose the company that best meets your needs.

How SEL and the Integrator Work for You

Together, SEL and the integrator of your choice will ensure that your modernization and upgrade projects meet regulatory requirements and achieve your operating objectives.

The nuclear integrator works closely with SEL and is your first point of contact throughout the entire lifecycle of your solution.

One of our partners—Framatome or Curtiss-Wright—will perform commercial-grade dedication, including all aspects of testing, documentation, and compliance necessary to implement SEL products in all levels of safety-related and quality-related nuclear systems.

The integrator will obtain the proper SEL product and qualify it for your application in accordance with the engineering change package and may also be contracted to install and commission the complete system, if desired.

After the system is operational, the integrator and our nuclear partners work with SEL to provide ongoing technical support for all SEL devices.

Upgrading electric power protection and control systems from electromechanical and solid-state relays to modern digital protective relays brings many benefits:

  • Improved operational flexibility—one SEL digital relay can provide the functionality of several electromechanical relays.
  • Increased reliability and availability—digital relays require less time out of operation for repair and maintenance.
  • Lower lifetime cost of operation—monitoring the health and performance of power system components helps increase operational efficiency and prevent expensive equipment failures.
  • Technical support—SEL provides responsive support and service for the entire lifecycle of our devices.

Operational Flexibility

Modern digital relays increase access to decision-making information that can increase operational efficiency. They also produce detailed data that can be recorded and analyzed to provide greater insight into the health and performance of the power system.

One intelligent electronic device (IED) provides functionality that can replace multiple legacy devices. In addition, digital protective relays perform continuous self-diagnostics and issue alarms in case of failure, helping to ensure that protection systems are functional.

Our experts can configure a cybersecure communication system that will allow valuable system information collected by the SEL relays to be securely shared to plant process computing systems to allow for real-time decision making and data collection. 


IEDs and network communications offer improved operational flexibility and reliability—but they also bring cybersecurity concerns.

Cybersecurity has been a primary consideration at SEL ever since we introduced the first microprocessor-based digital relays to the market in 1984, and we continue to lead the electric power industry in developing operational technology systems that maximize both cybersecurity and ease of operation.

We thoroughly test the source code in our devices to ensure their quality, security, and functionality. Source code is continually monitored for new threats, and customers are notified of updates and security patches for the full service life of every SEL product.

Meeting Regulatory Requirements

SEL has decades of experience in creating cybersecure operational technology systems. Our partners are well-versed in the cybersecurity requirements specific to nuclear facilities and can aid in cybersecurity assessments and approvals.

Together, your integrator and SEL will ensure that the electric power protection and control systems in your facilities not only meet all regulatory cybersecurity requirements, but also maximize both functionality and ease of operation.

From our knowledge base:

Engineering Services

SEL Engineering Services works closely with our partners, providing technical input in the engineering design change packages they develop.

Outside the “nuclear fence,” where nuclear safety ratings are not required, SEL provides fully engineered, turnkey solutions for every part of the electrical grid.

Cybersecurity Assessment and Support Services

From system assessment and baselining to cyber-defense solution development and ongoing system management, our full suite of security services can help strengthen your defenses and streamline the demands of maintenance and regulatory compliance.

Cyber services support contracts can include incident response, audits, system hardening, patch/update management, and more, depending on your anticipated needs.

Questions? Contact Us!

If you have any questions about SEL products, services, solutions, or support, please contact us. Our service and support professionals are ready to provide the answers you need.

Unbeatable Support

SEL support teams are stationed in regional offices around the world and staffed with application engineers who are experts in our products and in power system applications.

Technical support for SEL-manufactured devices is always free. No matter how often you need to call or how long your SEL products have been in service, you’ll reach an SEL expert who can provide the service and support you need.

Our cybersecurity team is always ready with the information and resources needed to keep your OT networks and critical systems secure and working effectively. Cyber services support contracts can include incident response, audits, system hardening, and more, depending on your anticipated needs.

More About SEL Warranty and Support