html{display:none} SEL-2740S Software-Defined Network Switch | Schweitzer Engineering Laboratories


Software-Defined Network Switch

The SEL-2740S is the industry’s first field-hardened software-defined networking (SDN)-enabled switch and is designed to improve Ethernet cybersecurity and performance for operational technology (OT) applications. The SEL-2740S and the SEL-5056 Software-Defined Network Flow Controller give you path- and packet-level control of your communications flows, which eliminates common cybersecurity vulnerabilities in traditional LANs and improves failover performance to less than 100 μs. SEL SDN also makes it easy to more precisely manage large amounts of network traffic, making it the perfect solution for anyone transitioning to IEC 61850. The SEL-2740S is designed for the harsh environments commonly found in electric utility substations and industrial plants.

SDN Modules—Available to Order Now

Starting At

$3,885 USD

Request a Follow-Up


Create Stronger Network Security—Control exactly what is allowed on your network with the deny-by-default architecture of the SEL-2740S. The flow table configuration allows matching rules on fields in Layer 1 through Layer 4 of the packet. This gives the system owner control of what is allowed on the network at every layer of the network. Only configured flows are forwarded. These rules can be preconfigured or dynamically set from the SEL-5056. SDN makes systems more cybersecure by eliminating attack-prone networking features, like MAC tables, the Rapid Spanning Tree Protocol (RSTP), and cast types.

Improve Failover Performance—SDN allows you to predefine every network path, bringing more precision to critical infrastructure networks and improving failover times to less than 100 μs, two orders of magnitude less than those achieved with traditional networking technology. And with no blocked ports for RSTP, all of the SEL-2740S ports are useable for communications flows.

Streamline NERC CIP Data Collection—Use the SEL-2740S and SEL-5056 with the SEL Flow Auditor application to automate reporting of NERC CIP-007-6 R1.1, 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 without affecting existing services and applications. 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 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)

    3. 3

      Dual power supply connections



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

Ensure mission-critical application performance.
Sub-100-microsecond failover times

Create stronger network security.
Deny-by-default access control

Provide centralized log collection.
Greater situational awareness using syslog 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 networking 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

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

Minimum QuickSet Version


Engineer a better network. It starts with SDN.

Watch Video New
Engineer a better network. It starts with SDN.

How to Use SEL-5056 Software: Installation and Adoption

Watch Video New
How to Use SEL-5056 Software: Installation and Adoption

How to Use SEL-5056 Software: Establishing Logical Connections

Watch Video New
How to Use SEL-5056 Software: Establishing Logical Connections

Sales Force Central access is required to view the content in this tab.

Sales Force Central