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      RTAC Conversion Kits

      Product Change Notice—Last-Time Buy
      SEL is announcing a Last-Time Buy (LTB) for the SEL-3532. It will no longer be available for purchase after February 3, 2025.

      Repurpose or extend the useful life of legacy SEL computing platforms running a Microsoft Windows operating system by converting it to an SEL Real-Time Automation Controller (RTAC).

      The SEL-3532 provides a CompactFlash card that converts the legacy device to the functionality of an automation controller. Use the available video port to connect the SEL RTAC to a monitor for an optional integrated human-machine interface (HMI) application.

      SEL-3532 RTAC Conversion Kit for:

      • SEL-1102 Computing Platform
      • SEL-3332 Intelligent Server
      • SEL-3351 System Computing Platform
      • SEL-3354 Embedded Automation Computing Platform

      The SEL-3533 provides a solid-state drive that converts the SEL-3355 computing platform to the functionality of an SEL RTAC.

      Starting At


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      Engineering Access and SCADA—Deploy the RTAC as a data concentrator using protocols such as IEC 61850 MMS client, Modbus, DNP3, IEC 61850 GOOSE, LG 8979, IEC 60870-5-101/104, or Mirrored Bits communications, and integrate both serial and Ethernet intelligent electronic devices (IEDs). Enable logging on any system or IED tag to view and archive station-wide event records. Enable multiple SCADA connections via serial or Ethernet communications.

      Distribution Automation—Improve the reliability and reduce the cost of a distribution system by commissioning the RTAC as a Distribution Automation Controller (DAC). A DAC provides wide-area Automatic Network Reconfiguration to minimize outage size and area by isolating faults and restoring power to unfaulted areas. It also provides dynamic feeder optimization functionality, which allows distribution tap changers, voltage regulators, and capacitor banks to work together as a team to control power factor and reduce voltage.

      Substation HMI—Provide cost-effective local and remote monitoring, control, and annunciation for substations and other processes by installing the optional web-based HMI, available for the RTAC and SEL-2240 Axion. acSELerator Diagram Builder SEL-5035 Software easily maps the RTAC tag database to reduce screen development time.

      Secure Communications and User Management—Employ the RTAC, SEL-3620 Ethernet Security Gateway, and SEL accessories to secure your automation network. Per-user security profiles provide compliance with role-based requirements. The system supports intrusion detection, notification, and logging to help maintain perimeter integrity. Secure Shell (SSH) and password management provide encrypted engineering access through the RTAC.

      Time Synchronization—Implement time-code inputs, such as IRIG-B and Network Time Protocol (NTP), to distribute precise time to connected IEDs. In the absence of an external time source, use the internal information processor clock to generate IRIG-B for connected devices.


      Integrated Security
      Avoid security concerns and obsolescence risks associated with Microsoft Windows operating systems because the SEL RTAC uses the secure and proven SEL real-time Linux operating system.

      Higher Processing Power
      Take advantage of rugged SEL computing platforms and the powerful logic engine of the SEL RTAC for high-speed automation synchrophasor processing and distribution automation on the SEL RTAC.

      Renowned SEL Reliability and Support
      SEL computing platforms are designed and tested to meet or exceed IEEE 1613 and protective relay specifications for harsh environments and to withstand vibration, electrical surges, fast transients, and extreme temperatures. The SEL RTAC running on an SEL computing platform operates reliably, even in the most challenging environments.

      Optional Integrated Web HMI
      Create web-based HMI one-lines, annunciator screens, and control scheme visualizations with the optional acSELerator Diagram Builder SEL-5035 Software. Directly connect your monitor to the integrated video port.


      Concentrate and manage data from new and legacy relays and other intelligent electronic devices (IEDs) using the extensive supported protocols:

      • Client
        • CDC Type II
        • Courier
        • DNP3 Serial
        • DNP3 LAN/WAN
        • EtherNet/IP—Explicit Message Client*
        • File Transfer Protocol (FTP)/Secure FTP (SFTP)*
        • Flex Parse
        • IEC 60870-5-101/104
        • IEC 60870-5-103
        • Modbus RTU
        • Modbus TCP
        • IEEE C37.118 Synchrophasors
        • SEL Protocols
        • LG 8979
        • IEC 61850 MMS and MMS Client File Services*,1
        • CP 2179
        • SES-92
        • Simple Network Management Protocol (SNMP)
        • OPC UA *,2
      • Peer-to-Peer
        • SEL Mirrored Bits Communications
        • Network Global Variable List (NGVL)
        • IEC 61850 GOOSE*
      • Server
        • CDC Type II
        • DNP3 Serial
        • DNP3 LAN/WAN
        • EtherNet/IP—Implicit Message Adapter*
        • FTP/SFTP
        • Modbus RTU
        • Modbus TCP
        • SEL Protocols
        • LG 8979
        • IEC 60870-5-101
        • IEC 60870-5-104
        • SES-92
        • IEEE C37.118 Synchrophasors
        • IEC 61850 MMS and MMS Server File Services*
        • SNMP Agent
        • OPC UA *,2
      • Field Bus Protocol
        • EtherCAT to SEL-2240 Axion I/O Modules*,1

      *Orderable Option

      1Not supported on the SEL-3505 and SEL-3505-3

      2Only supported on the SEL-3350 RTAC, SEL-3555, SEL-3560S, and SEL-3560E


      Minimum Software Version

      Video Playlists

      RTAC HMI

      • How to Use the RTAC HMI, Part 1: acSELerator Diagram Builder Overview
      • How to Use the RTAC HMI, Part 2: Building a Project
      • How to Use the RTAC HMI, Part 3: Shared Tags

      Latest Firmware Versions

      There are no firmware versions available for this product.

      Product Revision Firmware ID Date Available Serial Number

      The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

      Minimum Software Version