html{display:none} SEL-2742S Software-Defined Network Switch | Schweitzer Engineering Laboratories


Software-Defined Network Switch

The SEL-2742S is a 12-port DIN-rail- or surface-mounted network switch for industrial environments. The SEL-2742S combines with the SEL-5056 Software-Defined Network Flow Controller to improve LAN cybersecurity with a deny-by-default approach to network traffic forwarding. Software-defined networking (SDN) streamlines network management, change control, and data collection for cybersecurity audits.

The SEL-2742S is designed and built for operation in harsh environments, meeting IEEE 1613 requirements. The SEL-2742S operates in –40 to +85°C (–40 to +185°F), and dual power supply connections provide connectivity to primary and backup power sources.

Starting At

$2,200 USD

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Create Stronger Network Security—Control exactly what is allowed on your network with the deny-by-default architecture of the SEL-2742S. SEL SDN uses four layers of matching rules to check every packet entering switches. Only packets matching the user-configured criteria are forwarded. SDN also makes systems more cybersecure by eliminating attack-prone networking features, like MAC tables, the Rapid Spanning Tree Protocol (RSTP), multicast, and broadcast.

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 faster than those achieved with traditional networking technology. And with no blocked ports for RSTP, all of the SEL-2742S ports are useable for communications flows.

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-2742S switches.

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

Synchronize Time Over the LAN With Accuracy—The SEL-2742S 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
      Ethernet management port
    2. 2
      Dual power supply connections
    3. 3
      Two 10/100BASE-T PoE+ ports
    4. 4
      Four 1 Gbps ports—copper, single-mode fiber, or multimode fiber
    5. 5
      Six 10/100BASE-T ports—copper or multimode fiber
    1. 1
      Rugged chassis operates in –40 to +85°C (–40 to +185°F)
    2. 2
      Top hat DIN clip


Create stronger network security.

Deny-by-default access control

Simplify network design.

Topology-independent networking with proactive traffic engineering of primary and secondary data paths

Provide centralized network management.

Complete network visibility with formal change control and nondisruptive change management

Ensure mission-critical application performance.

Sub-100-microsecond failover times

Accurately distribute PTP.

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

Provide Power over Ethernet Plus (PoE+).

Two PoE+ ports to simplify the use of devices for IT overlay applications, like video and voice

Support primary and backup power sources.

Dual power supply connections supporting 24/48 V

Provide centralized log collection.

Greater situational awareness using Syslog to send and collect logs from all switches

Comply with Ethernet standards.

Support for IEEE 802.3 and OpenFlow 1.3 for communication between the SEL-5056 Flow Controller and all switches

Programmatically test networks.

Validation of all configurations and contingencies prior to commissioning

Operate in tough conditions.

IEEE 1613 compliance and a –40° to +85°C (–40° to +185°F) operating range


A Better Network for Ethernet-Based Protection

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

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

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