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Integrated Communications Optical Network

The SEL ICON is a wide-area-networking multiplexer optimized for industrial and utility applications. You can configure the ICON to operate as a SONET or Ethernet multiplexer, enabling the platform to address the following network usage cases:

  • Segregated operational technology (OT)—SONET transport
  • Segregated OT—Ethernet transport
  • Converged information technology (IT)/OT
  • Migrating analog leased services
  • Network-distributed time synchronization

ICON virtual synchronous networking (VSN) preserves the performance characteristics of time-division multiplexing (TDM) when converting to Ethernet as a transport protocol.

In addition to encapsulating critical services into the VSN container for deterministic transport, the ICON can allocate noncritical services, like video and SCADA, into standard IEEE 802.1Q Ethernet outside the VSN container. This enables the ICON to efficiently use bandwidth for Ethernet services and provide the flexibility to support the wide-area transport of all substation services.

By combining TDM and Ethernet transport options with a comprehensive range of data interfaces, the ICON makes it easy to migrate legacy network technologies to a converged IT/OT packet-based solution. The ICON interoperates with Multiprotocol Label Switching (MPLS) or Carrier Ethernet-based core networks to provide a hardened OT edge multiplexer for mission-critical applications.

SEL-5051/5052 Client/Server Network Management System (NMS) Software

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Transmission Line Protection—Implement current differential protection and direct transfer trip schemes with SEL relays. The ICON can communicate between relays with IEEE C37.94 circuits carried over an SEL ICON 2.4 Gbps SONET or 1 Gbps Ethernet fiber-optic link. You can apply the ICON Transfer Trip Module (TTM) to sense or assert contact closures for pilot protection schemes. The ICON network monitors and reports channel latency in real time. Selecting the shortest path between terminals as the primary path ensures that the system always reverts back to your primary configuration in the event of a path failure and subsequent restoration. These features, combined with robust IEEE 1613 environmental operating specifications, make the ICON ideal for critical power system applications.

Time Distribution—Distribute time information over the ICON WAN while maintaining accuracy better than 1 µs. You can use the ICON in power utility protection and monitoring applications, such as power system disturbance recording, synchrophasor measurement, and Sequential Events Records (SER) data collection. Each ICON node can be timed by GPS or over the WAN using SONET or PTP Telecom input for Ethernet transport. Each ICON node can generate IRIG-B and IEEE 1588 Power Profile time references for IEDs in substations. Timing accuracy of ‹1 µs can be maintained if the ICON network is locked to a suitable reference (GPS or Stratum 1 clock). With multiple time references, the ICON network is resilient to localized or wide-area GPS outages, equipment failure, and GPS spoofing. The SEL-5051/5052 enables centralized monitoring and troubleshooting of time synchronization.

Security Monitoring—Use the ICON to build substation security applications. You can connect fence, motion, panel, and door sensors to the SEL-2440 DPAC Discrete Programmable Automation Controller digital inputs and can connect strobes, sirens, and substation lighting to the control outputs. The ICON network can then communicate information back to a SCADA master.

IEC 61850 Network Optimization—Ensure optimal performance of IEC 61850-based systems by supporting VLANs and Ethernet Pipes (Epipes). Epipes can contain and isolate Layer 2 broadcast commands, such as IEC 61850 Generic Object-Oriented Substation Event (GOOSE) messages, from all other noncritical traffic on the network, ensuring very-low-latency data communications paths between intelligent electronic devices (IEDs).

Communications Aggregation—Consolidate legacy DS1 and DS0 circuits between locations onto the ICON WAN to replace leased circuits and optimize network performance. The ICON FXO, FXS, and 4-Wire VF Modules support legacy analog telephone, PBX, fax, and modem circuits. The ICON accepts channelized DS1 circuits from any source, and you can groom the individual DS0 circuits to terminate anywhere within the network.

Synchrophasor Communication—Transport synchronized phasor measurements (synchrophasors) to provide a real-time measurement of electrical quantities across a power system. You can use these time-synchronized measurements for analysis and control of the power system. The ICON provides all the necessary timing and Ethernet communications for synchrophasor information reporting. The ICON distributes time across the entire network and can maintain better than 1 µs accuracy among all terminals in the network when using SONET or Ethernet transports. This allows synchrophasor systems to continue to operate accurately even in the event of a local or system-wide GPS failure.

Security and Critical Infrastructure Protection—Protect critical infrastructure and help achieve NERC CIP compliance with SEL-5051 Network Management System (NMS) Client Software and SEL-5052 NMS Server Software, which provide password management, session authentication and encryption, and automatic security report generation of all changes made to system settings, firmware, and hardware. 

Operation in Harsh EnvironmentsThe ICON withstands vibration, electrical surges, electrostatic discharge, fast transients, and a –20° to +65°C temperature range. It meets or exceeds IEEE 1613 standards for communications networking devices in electric power substations. The ICON is available in a standard 19" rack-mount chassis or a compact ICON Cube package for limited-space applications.


    1. 1

      Enhanced Protected Line Modules

    2. 2

      Async Module for EIA-232, EIA-422, and EIA-485 circuits

    3. 3

      IEEE 1613-compliant packaging

    4. 4

      Internally wetted contact inputs

    5. 5

      IEEE C37.94 teleprotection interface

    6. 6

      FXS and FXO Submodules

    7. 7

      Transfer Trip Module

    8. 8

      IRIG-B output ports

    9. 9

      Server Module for network management, alarm I/O, and a GPS time reference

    10. 10

      8-port Ethernet switch

    11. 11

      Seven slots for access modules

    12. 12

      Dual redundant power supplies

    1. 1

      Enhanced Protected Line Modules

    2. 2

      Server Module

    3. 3

      Two slots for access modules (Ethernet Access and Quattro Modules shown)

    4. 4

      Dual redundant power supplies


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Minimum Software Version


Wide-Area Network Communications

Protection-Class Performance on a Converged Network

SEL ICON Basic Configuration Using USB

Latest Firmware Versions

There are no firmware versions available for this product.

Product Revision Firmware ID Date Available Serial Number
SEL-8020-01 R113-V0 SEL-8020-01-R113-V0-Z008001-D20180511 5/31/18 ~1181510001
SEL-8021-01 R115-V3 SEL-8021-01-R115-V3-Z010002-D20221007 1/7/23 ~1230070001
SEL-8021-01V R301-V3 SEL-8021-01-R301-V3-Z009001-D20230412 4/20/23 ~1231100001
SEL-8022-01 R102-V0 SEL-8022-01-R102-V0-Z003002-D20221007 1/7/23 ~1230070001
SEL-8029-01 R101-V0 SEL-8029-01-R101-V0-Z001001-D20131105 11/16/13 ~1133200001 or ~3133200001
SEL-8030-01 R129-V0 SEL-8030-01-R129-V0-Z022007-D20231121 1/13/24 ~1240130001
SEL-8035-01 R107-V0 SEL-8035-01-R107-V0-Z003002-D20180815 8/25/18 ~1182370001
SEL-8036-01 R102-V0 SEL-8036-01-R102-V0-Z002001-D20190215 2/6/19 ~1190370001
SEL-8036-02 R103-V0 SEL-8036-02-R103-V0-Z003001-D20200522 7/10/20 ~1201920001
SEL-8041-01 R105-V0 SEL-8041-01-R105-V0-Z004001-D20210212 9/24/21 ~1212670001
SEL-8041-04 R105-V0 SEL-8041-04-R105-V0-Z004001-D20210212 9/24/21 ~1212670001
SEL-8051-01 R106-V0 SEL-8051-01-R106-V0-Z003001-D20171004 10/7/17 ~1172800001
SEL-8051-02 R106-V0 SEL-8051-02-R106-V0-Z003001-D20171004 10/7/17 ~1172800001
SEL-8051-11 R100-V2 SEL-8051-11-R100-V2-Z001001-D20221130 12/9/22 ~1223420001
SEL-8051-12 R100-V2 SEL-8051-12-R100-V2-Z001001-D20221130 12/9/22 ~1223420001
SEL-8053-01 R109-V0 SEL-8053-01-R109-V0-Z004001-D20240216 3/9/24 ~1240690001
SEL-8053-02 R101-V0 SEL-8053-02-R101-V0-Z001001-D20240216 3/9/24 ~1240690001
SEL-8053-11 R101-V0 SEL-8053-11-R101-V0-Z001001-D20240216 3/9/24 ~1240690001
SEL-8053-12 R101-V0 SEL-8053-12-R101-V0-Z001001-D20240216 3/9/24 ~1240690001
SEL-8055-01 R100-V0 SEL-8055-01-R100-V0-Z001001-D20190228 4/16/19 ~1191060001
SEL-8056-01 R100-V0 SEL-8056-01-R100-V0-Z001001-D20180711 5/2/19 ~1191220001
SEL-8057-01 R101-V0 SEL-8057-01-R101-V0-Z001001-D20120810 9/25/12 ~1122690001
SEL-8057-02 R103-V0 SEL-8057-02-R103-V0-Z002002-D20220525 9/1/22 ~1222440001
SEL-8057-03 R100-V0 SEL-8057-03-R100-V0-Z001001-D20161209 1/21/17 ~1170210001
SEL-8057-11 R100-V1 SEL-8057-11-R100-V1-Z001001-D20221104 2/10/23 ~1230410001
SEL-8057-12 R101-V0 SEL-8057-12-R101-V0-Z001001-D20230407 4/12/23 ~1231020001
SEL-8057-14 R100-V0 SEL-8057-14-R100-V0-Z001001-D20231221 1/13/24 ~1240130001
SEL-8065-01 R104-V0 SEL-8065-01-R104-V0-Z002001-D20150901 9/9/15 ~1152520001
SEL-8065-02 R100-V0 SEL-8065-02-R100-V0-Z001001-D20190827 12/4/19 ~1193380001
SEL-8065-11 R100-V0 SEL-8065-11-R100-V0-Z001001-D20221104 12/14/22 ~1223480001
SEL-8065-12 R100-V0 SEL-8065-12-R100-V0-Z001001-D20221104 12/14/22 ~1223480001
SEL-8066-01 R104-V0 SEL-8066-01-R104-V0-Z001001-D20230630 7/8/23 ~1231870001
SEL-8067-01 R104-V0 SEL-8067-01-R104-V0-Z001001-D20150512 5/29/15 ~1151490001

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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Sales Resource Central
Cable Part NumberTerminationNotesUsed WithSchematic
C808LC or ST62.5/125 µm multimode fiber-optic cable, single-fiber or dual-fiber, 1 to 300 mPLM, EPLM, EBAM, Nx64FView
C809LC or ST9/125 µm single-mode fiber-optic cable, single-fiber or dual-fiber, 1 to 300 mPLM, EPLM, EBAM, Nx64FView
C953BNC–BNCIRIG-B cable, 1 to 500 ftPLM, EPLM, ServerView
C965TNC–TNCGPS cable, 1 to 340 ftServerView
CA605RRJ45–RJ45Cat 5e Ethernet cable, 1 to 330 ftEAM, EBAM, ServerView
C664USB-A–USB-BUSB cable, 6.5 ftServerView
C575Molex–Tinned WiresContact input, Molex 50579402 two-position connector, 3 to 100 ftServerView
C622RRJ48C–RJ48CDS1/T1/E1 cable, 1 to 330 ftDS1/E1 Async/Sync/ PsyncView
C649RJ48C–Tinned WiresDS1/T1/E1 cable, 1 to 330 ftDS1/E1 Async/Sync/PsyncView
C394RJ48C (Double)–RJ48C FemaleDS1/T1 combiner cable for redundant (1 × 1 protected) connections. Use C394 with C622R or equivalent RJ48C to RJ48C crossover cable.DS1 PsyncView
C437RJ45–DB25 FemaleEIA-422 cable, 1 to 100 ft422 SyncView
C471RJ45–DB37 FemaleEIA-422 cable, 1 to 6 ft422 SyncView
C392RRJ48C–DB25 FemaleITU-T G.703 cable, 1 to 330 ftG.703View
C616RRJ45–DB9 MaleEIA-232 single-circuit cable for connecting to a DTE device, 1 to 100 ftAsync Data, Async-CBView
C609RRJ45–DB9 FemaleEIA-232 single-circuit cable for connecting to a DTE device, 1 to 100 ftAsync Data, Async-CBView
C612MRJ45–DB9 MaleEIA-232 single-circuit with IRIG-B cable for connecting to a DTE device, 1 to 100 ftAsync DataView
C612RJ45–DB9 FemaleEIA-232 single-circuit with IRIG-B cable for connecting to a DTE, 1 to 100 ftAsync DataView
C607RRJ45–Tinned WiresEIA-232 triple-circuit or EIA-422/485 (2-wire or 4-wire circuits) cable for connecting to a terminal block on a DCE or DTE device, 1 to 100 ftAsync Data, Async-CB, 4-Wire VF, 4-Wire BridgingView
C629NRJ45–RJ45EIA-232/422/485 crossover cable for connecting to a DCE device or another ICON Async Data module, 1 to 100 ftAsync Data, Async-CBView
C480RJ45–DB9 FemaleEIA-232 cable with mounting nuts for connecting to a DCE transceiver or existing cable, 1 to 6 ftAsync Data, Async-CBView
C611RJ45–DB9 Female (Double)EIA-232 dual-circuit cable for connecting to two DTE devices, 3 to 100 ftAsync Data, Async-CBView
C611MRJ45–DB9 Male (Double)EIA-232 dual-circuit cable for connecting to two DTE devices, 3 to 100 ftAsync Data, Async-CBView
C648RJ45–DB9 Male (Triple)EIA-232 cable for connecting to three DTE devices, 1 to 50 ftAsync Data, Async-CBView
C612TRJ45–DB9 Male With BNCEIA-232 with IRIG-B cable for connecting to a DTE device, 2 to 100 ftAsync DataView

ICON - Software Tab

Configuration Software

SEL-5051/5052 Client/Server Network Management System (NMS) Software

Manage SEL ICON networks with either standalone SEL-5051 Client Software or a combination of SEL-5051 Client and SEL-5052 Server Software. SEL-5051 Client Software connects to SEL-5052 Server Software to provide an efficient solution for managing network access for multiple users.

Learn more and download on the SEL-5051/5052 software page.