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      Ethernet Switch

      The SEL-2731 is a Rapid Spanning Tree Protocol (RSTP) and operational technology (OT) software-defined networking (SDN) managed Ethernet switch that is optimized for OT environments, supporting critical infrastructure applications—including IEC 61850 networks, protection-class Ethernet networks, engineering access, SCADA, and process control systems. It is designed for extended product lifecycles and high reliability, even in the toughest environmental conditions commonly found in electric utility and industrial applications, and it is backed by our industry-leading ten-year warranty.

      SFP Transceiver Options

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      Build Your Perfect 24-Port Switch—Choose from copper or small form-factor pluggable (SFP) options on eight 1 Gbps/100 Mbps and sixteen 100 Mbps ports. Mix and match port types in groups of four. The SEL-2731 offers flexible mounting options and wide-range dual power supplies. It supports both SEL and non-SEL fiber SFPs with a generous power budget.

      Future-Proof Your System—Order the SEL-2731 with either RSTP-based or OT SDN-based control plane technology. With a simple firmware upgrade, you can field convert between RSTP and OT SDN.

      Synchronize Time Over the LAN With Accuracy—The SEL-2731 is a transparent Precision Time Protocol (PTP) clock that supports the IEEE C37.238-2017 power system profile to ensure submicrosecond time synchronization of end devices.

      Operate in Tough Environments—The SEL-2731 is designed without fans or other moving parts, increasing its operational lifetime. It is built and tested for reliable operation in extreme environments, meeting or exceeding IEEE 1613 (Class 1) and IEC 61850-3 standards for communications devices in electric power substations.


      Simplify Network Commissioning—Installing and configuring the SEL-2731 is simple. You can easily set up priority messaging with VLANs, which ensures the transmission of IEC 61850 GOOSE messages and current differential traffic to IEDs while segmenting protection, control, and automation traffic. Update settings either through a secure web interface or by importing configuration files. Using configuration files makes backups and restoration easy.

      Preserve Network Integrity—Use the Bridge Protocol Data Unit (BPDU) Guard in the SEL-2731 to prevent unauthorized network extensions. Provide central authentication with the Lightweight Directory Access Protocol (LDAP) or one- or two-factor authentication with Remote Authentication Dial-In User Service (RADIUS). Protect client saturation with rate limiting.

      Easily Segment and Monitor a Flexible Network Topology—Use any of the available 4,094 VLANs for switch-to-switch connections with the SEL-2731. Monitor VLAN configurations with easy-to-read graphics. Monitor the status through Syslog and the Simple Network Management Protocol (SNMP).

      OT SDN

      Create Stronger Network Security—Control exactly what is allowed on your network. The SEL-2731 and SEL-5056 Software-Defined Network Flow Controller software have a deny-by-default architecture and deliver multilayer packet inspection at each hop. Only packets matching authorized communications flows are forwarded; all others are dropped or sent to your intrusion detection system. OT SDN also makes systems more cybersecure by eliminating legacy, attack-prone networking features, like media access control (MAC) tables, RSTP, multicast, and broadcast.

      Improve Failover Performance—Proactively engineer your network traffic with OT SDN. This solution brings more precision and predictability to critical infrastructure networks, reliably supporting even the most demanding control system signals, such as Sampled Values. Failover time is less than 100 μs—two orders of magnitude faster than what legacy networking technology can achieve. And since there are no blocked ports for RSTP, you can use all SEL-2731 ports for communications flows.

      Streamline NERC CIP Data Collection—Use the SEL-2731 to establish inline, non-bypassable security controls for ports and services. Use the SEL-2731 and flow controller software with the SEL Flow Auditor application to automate information collection and reporting of NERC CIP-007-6 R1.1 without dangerous scanning or expensive site visits, which addresses system security management for open ports and services on cyber assets.

      Centralize Network Configuration and Updates—Manage your network, not individual switches. The SEL-5056 Flow Controller software centralizes network configuration and all changes to the network, eliminating the need to update settings in individual switches.


        1. 1

          LEDs for general device status.

        2. 2

          LEDs indicate the status of each power supply.

        3. 3

          Tricolor LEDs indicate the status of each Ethernet port.

        4. 4

          Slide-in configurable label.

        5. 5

          Ethernet port for local engineering access.

        6. 6

          Select from rack-, surface-, or panel-mount options.

        1. 1

          Eight 1,000 Mbps/100 Mbps Ethernet ports and sixteen 100 Mbps Ethernet ports that accept copper or SFP connections

        2. 2

          Form C alarm contact

        3. 3

          Redundant power supply options



      The SEL-2731 is designed, built, and tested for reliable operation in extreme conditions. It meets or exceeds IEEE 1613 (Class 1) and IEC 61850-3 standards for communications devices in electric power substations and has a specified temperature range of –40º to +85ºC (–40º to +185ºF).

      The SEL-2731 can be equipped with a single or dual power supply in high or low voltage. A dual power supply allows simultaneous connection to primary and backup power sources. This ensures that a single power source failure cannot result in loss of service.

      High-Bandwidth and Flexible Port Options
      The SEL-2731 supports eight 100/1000 Mbps ports and sixteen 100 Mbps ports. All ports can be ordered with either copper or SFP cage options. Mix and match port types in groups of four to build your perfect switch. The SEL-2731 supports all SEL SFPs as well as third-party SFPs that operate at 100- or 1000BASE-T.

      Quality of Service
      The SEL-2731 provides flexible traffic priority configuration management through four 8:4:2:1 weighted round robin (WRR) priority queues.

      Time Synchronization
      The SEL-2731 offers PTP transparent clock support for the IEEE C37.238-2017 power profile and switch synchronization through the Network Time Protocol (NTP).

      SEL manufactures all switches in the United States and offers a worldwide ten-year product warranty.


      Easy to Use and Administer
      The autonegotiation function enables the SEL-2731 to easily autoconnect to third-party devices in the network. The web management interface has been engineered to make common tasks easy to accomplish, such as setting up network segmentation using VLANs. Mirror any selection of ports for integration with an intrusion detection system. Configure settings online through the secure web interface or offline for later implementation. Access to the HTTPS web interface can be managed centrally via LDAP or RADIUS.

      Comprehensive security features, such as SNMPv3, HTTPS, LDAP, Syslog, and RADIUS, ensure that only authorized users have access to the switch. Detailed logs show you everyone who has accessed the switch and any action that was taken.

      BPDU Guard prevents undesired network changes from affecting the network. Port rate limiting helps prevent broadcast, multicast, or unicast Ethernet storms from disrupting network operations.

      OT SDN

      SDN Provides Zero-Trust Cybersecurity
      The SEL-2731 provides deny-by-default network access control and secure communications management by securing the control plane with OpenFlow 1.3 over Transport Layer Security (TLS).

      IEC 61850 Support
      The SEL-5056 Flow Controller software can import IED 61850 SCD files and automate network provisioning.

      Reliable Operations and Fast Fault Restoration
      The SEL-2731 supports IEC 61850-3 and IEEE 1613. It retains flow configuration through power cycles, even when the flow controller is offline. It also heals network faults in less than 1 millisecond.

      Ease of Use
      The SEL-2731 supports orchestration interfaces for end-to-end circuit provisioning, automated commissioning using the SEL-5056 Flow Controller, and multiple LED modes for easy onsite troubleshooting.

      Situational Awareness
      The SEL-2731 integrates with the flow controller software for central configuration, change management, operational diagnostics, and telemetry statistics.

      Logging and Diagnostics
      Generate and send log events using Syslog. Choose either UDP or TLS/TCP delivery for your Syslog messages.

      SFP Transceivers
      Choose from a range of SFP transceivers that meet the required temperature and environmental specifications of SEL products.

      SFP Transceiver Options

      Mounting Options
      The SEL-2731 is available in panel-mount, surface-mount, and rack-mount hardware packages.

      Minimum Software Version


      Engineer a better network. It starts with SDN.

      How to Use SEL-5056 Software: Installation and Adoption

      How to Use SEL-5056 Software: Establishing Logical Connections

      Video Playlists

      SDN Commissioning support videos

      • SEL-5056 Using the Learn & Lock Feature
      • Commission and User Creation with the SEL-5056 Flow Controller
      • Adopt SEL-2740S Using the SEL-5056 Flow Controller
      • Adopt Hosts using the SEL-5056 Flow Controller

      Videos in this series:

      • SEL-5056 SDN Quick Start
      • SEL-5056 Logical Connections Part 1- CSTs and Logical Connection Definitions
      • SEL-5056 Logical Connections Part 2- Creating CSTs
      • SEL-5056 Logical Connections Part 3- Creating Unicast Logical Connections
      • SEL-5056 Logical Connections Part 4- Creating Multicast Logical Connections
      • Enabling SEL Relay Failover Mode with the SEL-5056 Flow Controller
      • SEL-5056: Switch Replacement Before Onsite Deployment
      • SEL-5056: Switch Replacement After Onsite Deployment
      • SEL-5056: Host Replacement in Same Location
      • SEL-5056: Host Replacement in Different Location

      Videos in this series:

      • Backing Up and Restoring SEL-5056 Databases

      Latest Firmware Versions

      There are no firmware versions available for this product.

      Product Revision Firmware ID Date Available Serial Number
      SEL-2731 R100-V3 SEL-2731S-R100-V3-Z001001-D20240523 5/24/24 ~1241140001
      SEL-2731 R100-V1 SEL-2731M-R100-V1-Z001001-D20240523 5/24/24 ~1241140001

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

      Minimum Software Version

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      Product Certifications

      UL Certification - Plain

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