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      Software-Defined Network Switch

      The SEL-2740S is designed to perform reliably even in the toughest environmental conditions commonly found in electric and industrial applications. The SEL-2740S is specifically developed to support IEC 61850 network requirements with industry leading performance and cybersecurity. The operational technology (OT) software-defined networking (SDN) solution supports enterprise and OT requirements ranging from real-time control to process control systems (PCSs), distributed control systems (DCSs), and SCADA.

      SDN Modules—Available to Order Now

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      Create Stronger Network Security—Control exactly what is allowed on your network with the deny-by-default architecture and multilayer packet inspection at each hop with the SEL-2740S. OT SDN allows you to control what devices are allowed on your network and what conversations each device is allowed to have. Only packets matching the authorized conversations are forwarded; all others are dropped or forwarded to your intrusion detection system. OT SDN also makes systems more cybersecure by eliminating legacy, attack-prone networking features, like MAC tables, the Rapid Spanning Tree Protocol (RSTP), multicast, and broadcast.

      Improve Failover Performance—OT SDN proactively traffic-engineers networks, bringing more precision and predictability to critical infrastructure networks and improving failover times to less than 100 μs, two orders of magnitude less than those achieved with legacy networking technology. And with no blocked ports for RSTP, all of the SEL-2740S ports are usable for communications flows.

      Streamline NERC CIP Data Collection—Use the SEL-2740S to establish inline, nonbypassable security controls for ports and services. Use the SEL-2740S and SEL-5056 with the SEL Flow Auditor application to automate information collection and reporting of NERC CIP-007-6 R1.1 without dangerous scanning or expensive truck rolls, which addresses system security management for open ports and services on cyber assets.

      Manage Network Scalability and Change Management—Use the SEL-5056 to manage all network changes. All network additions and changes can be configured centrally and pushed out to configure the network of SEL-2740S switches.

      Programmatically Test and Validate Your Network—Reduce deployment timelines and eliminate errors by using the SEL-5056 to programmatically test the network implementation and validate all configurations and contingencies prior to commissioning.

      Synchronize Time Over the LAN With Accuracy—The SEL-2740S acts as a transparent Precision Time Protocol (PTP) clock, supporting the IEEE C37.238-2017 power system profile to ensure submicrosecond time synchronization of end devices.


        1. 1

          Lamp Test button verifies all LEDs are functional and lets you select the LED mode

        2. 2

          General status indicators

        3. 3

          Power supply status LEDs

        4. 4

          Ethernet port status LEDs

        5. 5

          Three LED modes are available for the Ethernet port status

        6. 6

          Out-of-band flow controller port

        1. 1

          Flow processor and alarm contact

        2. 2

          Five modular slots for copper or fiber Ethernet interface options (in sets of four)

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          Dual power supply connections



      Accurately distribute PTP.
      Support for IEEE 1588 PTP transparent clock with the IEEE C37.238-2017 power system profile

      Ensure mission-critical application performance.
      Sub-100-microsecond network recovery times

      Create stronger network security.
      Deny-by-default access control, multilayer packet inspection at each hop, and cryptographically secure control plane

      Provide centralized log collection.
      Greater situational awareness using Syslog and SNMP to send and collect logs from all switches

      Design exact configurations to match the application.
      Flexible 4-port Ethernet module options

      Integrate seamlessly with existing infrastructure.
      OpenFlow 1.3 support

      Simplify network design.
      Topology-independent network performance with proactive traffic engineering of primary and secondary data paths

      Simplify the implementation of power utility and industrial OT networks.
      SEL-5056 Software-Defined Network Flow Controller automates network configurations from the IEC 61850 Substation Configuration Description (SCD) files.

      Programmatically test networks.
      Validation of all configurations and contingencies prior to commissioning

      Provide centralized network management.
      Complete network visibility with formal change control and nondisruptive change management

      Operate in tough conditions.
      IEEE 1613 compliance, KEMA certification, and –40° to +85°C (–40° to +185°) operating range

      Mounting Options
      The SEL-2470S is available in a panel-mount, surface-mount, or rack-mount hardware package to suit your application needs.

      SDN Modules
      The SEL-2740S offers numerous SDN module options, including copper or fiber Ethernet interfaces, processors, power supplies, and blank plates.

      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-2740S R113-V1 SEL-2740S-R113-V1-Z001001-D20240501 5/1/24 ~1240900001

      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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      2740S 2742S - Software Tab

      Configuration Software

      SEL-5056 Software-Defined Network Flow Controller

      The SEL-5056 Flow Controller optimizes configuration and management for the SEL OT SDN solution. The flow controller works collectively with OT SDN switches to provide a complete traffic-engineering solution for Ethernet-based LANs.

      Learn more and download on the SEL-5056 software page.

      Automated Data Collection

      SEL-5057 SDN Application Suite

      SEL-5057 integrates with the SEL-5056 Software-Defined Network Flow Controller to add capabilities to the SEL OT SDN solution, including streamlining data collection for NERC CIP compliance.

      Learn more on the SEL-5057 software page.