html{display:none} Automation | Schweitzer Engineering Laboratories


If your distribution system has recloser controls with communications outside the substation, you can further improve performance and reliability by implementing distribution automation.

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The scalable, modular nature of SEL automation solutions allows you to implement a broad set of functionalities or choose a subset and add more capabilities over time.

Plus, when you choose SEL, you get more than just a product—you get the industry’s best customer service and technical support.

SEL automation solutions are ideal for:

  • Automatic fault location, isolation, and system restoration.
  • Centralized capacitor bank control.
  • Planned outage management.
  • Dynamic voltage control.

Distribution Automation Solutions

SEL Engineering Services provides automation solutions that improve reliability, increase operational efficiency, and reduce operation costs.

We can design and implement a broad set of functionalities or a subset that addresses your specific needs. Our scalable, modular distribution automation controller (DAC) integrates with the IEDs already in your system—and we can also provide protective relays, recloser controls, secure communications, and other equipment as part of the solution, depending on your needs.

Automation Control Products

Increase system reliability and operation efficiency using SEL automation controllers, which offer scalable and modular solutions for data concentration, protocol conversion, and more.

Our automation controllers and communications equipment are tested to the same durability standards as our relays and carry the same ten-year warranty.


SEL-3530/3530-4 Real-Time Automation Controller (RTAC)

The SEL-3530 RTAC provides complete and flexible system control with integrated security, seamless configuration, and unified logic. The SEL-3530-4 is a compact version of the SEL-3530 that is small enough to be installed in recloser cabinets.

  • Use the RTAC as a SCADA remote terminal unit (RTU).
  • Substation control—build custom IEC 61131 logic and access all system data for unparalleled control flexibility.
  • Integrate IEDs into control and automation schemes.
  • Automatic event collection—detect, filter, and collect event data from connected SEL relays.
  • Concentrate, exchange, and convert data.

SEL-FLT and SEL-FLR Fault and Load Transmitter and Receiver System

Improve fault location throughout your distribution system. This line-powered wireless transmitter and receiver system is flexible and easy to deploy.


  • Place transmitters on feeders, taps, and laterals to enable better emergency switching decisions.
  • Report faults and load current measurements to SCADA via the SEL-FLR receiver.
  • Integrate into existing systems—no additional software is needed.
  • Dispatch crews to more precise locations. LEDs on the fault transmitter also allow physical ID of the reporting unit.
  • Enable phase balancing and system planning with highly accurate load data.

SEL-3505/3505-3 Real-Time Automation Controller (RTAC)

The SEL-3505 controller is a lower-voltage version of the SEL-3530 RTAC. The SEL-3505 RTAC is compact and delivers all the standard features of an RTAC.


SEL-3555 Real-Time Automation Controller (RTAC)

The SEL-3555 is the fastest and most powerful RTAC for advanced data concentration and control.


SEL-2240 Axion

Remote data acquisition in a rugged, modular platform. Choose versions with 4 or 10 slots, and mix and match the I/O modules to fit your application. Each Axion becomes a node in your control network, sending deterministic fiber-optic communications to remote terminal units (RTUs) and relays.

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SEL Wireless Protection System

Apply this system with your existing protection schemes to help relays make better tripping and reclosing decisions based on the location of the fault. Combining the SEL-FT50 Fault Transmitter, SEL-RP50 Fault Repeater, and SEL-FR12 Fault Receiver provides a flexible, economical way to enhance distribution protection and improve the reliability and safety of your feeder lines.

Products and Service You Can Rely On

SEL products are designed and manufactured for the world’s most challenging environments, exceeding all industry standards for temperature, shock, and electric stress. An optional conformal coating for circuit boards adds an extra level of protection against contaminants in extreme environments.

Every SEL product comes with a ten-year warranty—the best in the industry. If any product fails under warranty, we’ll repair or replace it for free.

Questions? Contact Us!

We’re happy to answer all your questions and help develop the best solution for your needs.

Contact Engineering Services


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.