High Voltage Direct Current (HVDC) systems enable utilities to move more power further, efficiently integrate renewables, interconnect grids, and improve network performance. HVDC systems utilize power electronics technology to convert AC and DC voltage and are ideal for supporting existing systems or building new power highways.


GE Vernova provides solutions that offer grid operators the ability to provide reactive power support, enhance controllability, improve stability and increase power transfer capability of AC transmission systems.


GE Vernova's Grid Solutions' EBoP systems cater to all types of project requirements including supplying equipment, engineered packages, and full engineering, procurement and construction (EPC) implementations.


GE Vernova offers solutions for a variety of substation projects and applications, including Modular Substation Automation Systems, utility and industrial substation projects, as well as DC substation solutions.


The energy landscape today is changing, this is being led by the current industry trends of Decarbonization, Digitization, Decentralization and Electrification. Discover how GE Vernova is working with utility, consumer and industrial customers to design and deploy tailored Microgrid and Distributed Energy Resource (DER) Management solutions.


GE Vernova offers a wide range of transformer solutions for the utility, industrial, commercial, residential and energy markets. These solutions feature flexible, reliable and robust designs to support a wide range of applications. With units operating in some of the most demanding electrical environments around the world, We design and delivers transformer solutions that provide among the highest level of performance and reliability to meet rigorous operating requirements.


GE Vernova provides GIS solutions from 50 kV to 800 kV, along with secondary products to maximize switchgear and network operation. The portfolio includes a full range of SF6 GIS as well as g3 (SF6-free) GIS at 145 kV and 420 kV voltage levels for utilities and industries worldwide.


GE Vernova is one of the top circuit breaker suppliers in the world. Our products include a range of live tank circuit breakers (up to 800 kV), dead tank circuit breakers (up to 550 kV), as well as hybrid and compact switchgear assemblies. We also provide solutions for power generation applications with our generator circuit breakers for installations up to 1,500 MW.


GE Vernova is a global market leader for disconnectors (disconnect switches) since 1960, with 8 product facilities in 7 countries and hundreds of thousands installations in more than 130 countries around the world. The portfolio includes disconnectors for AC applications (up to 1,200 kV), for DC applications (up to 1,000 kV) and for railway applications. We also offer power connectors to connect two or more conductors for a continuous electrical path.


GE Vernova is an industry leader in the design and manufacturing of high, medium and low voltage instrument transformers. With more than 100 years of experience, We offer a broad array of standard and high accuracy models for revenue metering and system protection applications. The portfolio of instrument transformers ranges from low voltage at 600 V suitable for industrial and high accuracy revenue metering, all the way up to high voltage at 1,200 kV. The portfolio also includes line traps and digital instrument transformers.


For a century, utilities have relied on us to deliver electrical products and services to meet their quality, durability and performance needs. Our capacitor and reactor product lines are an integral part of our portfolio. GE Vernova provides power capacitors that meet ANSI, IEEE and IEC standards, and our low voltage capacitors are UL listed. Ratings range from 1 kvar to 500 MVAR, and from 240 volts to 500 KV.


GE Vernova provides a broad range of bushings and surge arresters to help protect electrical assets. The bushings portfolio includes AC and DC solutions that enable long life, high reliability and installation flexibility. GE’s Tranquell surge arresters are ideal for distribution and EHV applications up to 612kV, and are available as polymer and porcelain station and intermediate class IEEE/ANSI C62.11.

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SF6 (or Sulphur Hexafluoride) has been the standard gas used inside high voltage electrical equipment as an insulating and arc-quenching medium. However, SF6 is also listed as a potent greenhouse gas according to the Kyoto Protocol, with 24,300 times the comparative Global Warming Potential (GWP) of CO2 and a lifetime of 1,000 years in the atmosphere. With grid operators across the world becoming increasingly concerned about the environmental impact, we offer a commercially available and viable alternative to SF6 to help utilities and industries reduce their environmental impact.


GE Vernova offers a wide range of solutions to monitor and manage critical assets on the electrical grid, detect and diagnose issues and provide expert information and services to customers. Our asset monitoring and diagnostics portfolio includes solutions for single- and multi-gas transformer DGA, enhanced transformer solutions and switchgear monitoring, as well as software and services.


GE Vernova's Grid Solutions business electrifies the world with advanced grid technologies and systems, enabling power transmission and distribution from the grid to homes, businesses, and industries effieciently and reliably.

The GridBeats™ portfolio is designed to streamline grid digitalization, improve grid resilience, and empower utilities to manage their networks remotely, particularly in the face of the energy transition.


GE Vernova's Critical Infrastructure Communications solutions deliver comprehensive networks that are designed to be secure, flexible, and tailored to meet customers' objectives and unique geographic requirements.


GE Vernova's comprehensive portfolio of solutions for implementing and managing a substation.


The collection of required asset condition data from the field on a large scale for GE Vernova and 3rd party electrical equipment is a key step in building a robust Asset Performance Management strategy. Grid Services specialists are constantly evaluating and implementing new innovative inspection technologies applying strict processes and methods. The digital inspections methods are designed to improve the efficiency of data collection, oil analysis and online monitoring. All new approaches to capture data are integrated into the EnergyAPM ecosystem for automatic data transfer.


Business environment is constantly transforming for substation owners but the need to deliver consistent outcomes remains. That’s where a Flexible Service Agreement can help. By partnering with GE Vernova on a long term, customers can realize the full potential of their electrical substations and network assets while balancing performance and investment, along with predictable costs and flexible billing arrangements, letting them get back to focusing on what matters.


Energy costs are significant expenses for utilities and industries at large, particularly those that are energy-intensive or operate heavy machinery. Between 5% and 25%* of the expenses in these organizations are allocated to energy payments, with up to 15%** of this energy consumption being wasted during operations.


GE’s innovative and high-quality services help maintain and optimize high-voltage electrical assets throughout their entire lifecycle. Leveraging the design and manufacturing knowledge of our engineers, the customized service solutions ensure substations and networks perform as planned. Experts deliver services for applications across the power system, keeping assets up-to-date, safe, reliable and efficient while improving customers’ return-on-investment.


GE Vernova provides a full range of services & support tailored to meet a broad range of power system needs across utility and industrial applications. With deep domain knowledge and industry expertise GE’s service application engineers and technical specialists can help plan, design, operate, maintain, and modernize your protection, control, monitoring and automation systems.


GE Vernova provides comprehensive services throughout the systems lifecycle. The services can be provided by our local team and with the support of our global Competence Centers when the equipment is installed, during the warranty period and beyond.


Our technical experts are ready to equip customers with the knowledge needed to effectively manage their critical assets and systems, and increase their return on product investments. Our training courses are offered in a variety of ways, including online, onsite at customer locations, and in our state-of-the art training centers around the world.


GE Vernova's Grid Solutions' Testing Laboratories enable manufacturers and end users to test their primary equipment by leveraging deep domain expertise and testing facilities, to develop enhanced high voltage products and certify their capabilities before market introductions.


GE Vernova delivers materials and eco-design studies for high voltage solutions to accelerate insulation and environmental innovation. GE’s services provide the expertise and methods that enable new value to support customer engineering, sourcing, quality control and EHS activities.


With the rapid digitalization of the grid, utility, power generation and industrial operators require cybersecurity solutions to monitor and protect grid asset and systems from increased severity and frequency of cyber attacks. GE Vernova adopted a “defense in depth” approach, providing innovative cybersecurity solutions designed to increase operational integrity, comply with regulations and control costs of security.


Utilities today seek to create and connect new sources of power generation to meet growing global demand, while also managing grid reliability, costs and regulatory factors.


Water is central not just to the economy, but to life. As a result, water treatment systems demand secure, dependable power to ensure process uptime. From the grid-connected substation to reliable electrical protection, control, and power quality metering, GE Vernova offers tailored solutions to keep critical plants operational and meet the unique needs of the water and wastewater industry.


As power systems become increasingly interconnected and complex, utilities need solutions that optimize energy transmission and management while improving reliability.


Data centers – and the information they store – are becoming increasingly integral to the way we live our lives every day. With rising demand also come rising costs. And more importantly, the information in these centers must remain secure while simultaneously accessible. We provide data centers with electrical infrastructure solutions from the input utility source to the IT server racks. This includes high-voltage switchgear and transformers, medium and low voltage electrical equipment, automatic transfer switches, switchboards, UPS systems, critical power PDUs, static transfer switches, and overhead busway. This chain of electrification products provides high quality and reliable products and services for the entire lifecycle of a data center.


The oil and gas industry is evolving at a rate never seen before, facing shifting pricing levels, ever-changing regulatory requirements, and increased environmental consciousness. Through reliable, safe, and innovative solutions and a holistic service offering, GE Vernova can help the energy sector thrive in this changing reality.


Modernizing and digitizing the distribution grid is imperative for utilities and customers to enhance power system stability and safety, while increasingly integrating distributed power and demand response.


The industry is changing. Simultaneously, so are your utility’s needs. Operational effectiveness, power stability, and critical asset management are key priorities – whether in pulp and paper, steel, or data centers. GE’s holistic portfolio of products and services are designed with reliability, innovation, and sustainability at the forefront, helping you face the energy transition with ease.


Mining companies require secure communications, efficient asset performance management, and dependable, innovative technology to protect their critical assets. GE Vernova offers a broad product portfolio to help you through each step of the mining process – safely and reliably.

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Switches & Converters

Home > Switches & Converters > Ethernet Switches > S20

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  Legacy Ethernet Switches

Reason S20
Managed Ethernet Switches

GE’s Reason S20 series of managed Ethernet switches are designed to enable an IEC 61850 digital substation network, including IEEE 1588v2 (PTP), in harsh environments within power systems and industry applications. Using the Reason S20, packet switching between substation devices is flexible, reliable and robust, even in situations where routing is necessary.

A flexible, modular design allows the Reason S20 series to support a wide range of network architectures. The Reason S20 series includes the following models:

  • S2020, the cost-effective choice, offers a high density of Ethernet ports in a 1U form factor for easy rack mounting. This model supports up to 5 modules with 4 ports each and allows configurations with up to 20 fast Ethernet ports or up to 4 gigabit ports plus 16 fast Ethernet ports.
  • S2024, the premium model, offers full gigabit Ethernet switch functionality. This model supports up to 24 ports, provided by 6 interface modules with 4 ports each. The 1U mechanical design is identical to the S2020 model.

In both S2020 and S2024 models, layer 3 functions and IEEE 1588v2 PTP (all ports, hardware-based) can be upgraded via a licensing file. The Reason S20 switches can be configured and managed cyber-securely using an SSH command line interface or an HTTPS graphical interface. Both models offer full cyber security features by default, including RADICUS/TACACS+ remote authentication technology, password encryption and digitally signed firmware, enabling operators to fully comply with NERC CIP guidelines and regulations. Statistical information and file management can be operated using SNMP v3.

What's New
Key Benefits
Cyber Security
IEC 61850 Networks
IEEE 1588v2
SFP Transceivers
S20 industrial Managed Ethernet Switch

S20 firmware

The firmware 07A07 versions adds Digital Diagnostics Monitoring (DDM) functionality for optical SFP transceivers as well as new alarms using the dry-contact relay or SNMP traps were add based on DDM measurements. For the full list of enhancements, please refer to the firmware release notes.

S20 hardware

S20 Hardware version C

GE’s Reason S20 design has been enhanced with hardware version C, delivering a brand-new High Voltage power supply and other updates, enabling:

  • Full compliance with environment and EMC requirements of IEC 61850-3 edition 2
  • Full compliance with environment and EMC requirements of IEEE 1613:2009 and its extension IEEE 1613.1:2013.
  • UL 60950-1 recognition
  • Real Time Clock (RTC) along with a supercapacitor activity for 2 days after S20 is powered-off.
MDS Pulsenet

Reason S20 integrates with MDS PulseNET (FW 07A03)

MDS PulseNET (v4.5.0) network management software has been modified to include configuration management and backups, syslog servers and numerous other features specific to GE Reason products. Switches can now be discovered and managed quickly and easily as part of the overall Industrial Communications eco-system.

Main NMS features:

  • System monitoring (alarms, ports, health status)
  • Centralized Configuration Management (including backup)
  • Automatic system discovery based on a range of IP addresses
Layer 3 functionalities

Layer 3 functionalities (FW 07A)

S20 supports Layer 3 capabilities, featuring the following protocols:

  • Routing Information Protocol (RIP) version 1 and 2 - RFC 1058 and RFC 2453
  • Open Shortest Path First (OSPF) version 2 - RFC 2328
  • Virtual Router Redundancy Protocol (VRRP) - RFC 2338
  • Static Routing

Key Benefits

The flexible and robust Reason S20 Ethernet switches provide customers with a variety of benefits, including:

  • Network Management Software (NMS) integration with MDS PulseNET (v4.5.0)
  • Layer 2 and 3 Managed Ethernet Switch
  • Fully flexible Ethernet switch for industrial applications, including PRP redundant networks
  • Ready for IEC 61850 networks (tests performed by KEMA)
  • Store-and-forward packet switching
  • Media Access Control (MAC) bridges and Spanning Tree Protocol as standardized by the IEEE 802.1D
  • IP Routing functionalities: Static, Routing Information Protocol (RIP) and Open Shortest Path First (OSPF)
  • Virtual Router Redundancy Protocol (VRRP) to eliminate a single point of failure in static routed environments
  • UltraRSTP (Rapid Spanning Tree Protocol - IEEE 802.1W) with fault recovery time less than 5 ms per hop, meeting IEC 61850-90-4 specifications
  • Bridge Protocol Data Unit (BPDU) guard and filtering to prevent external interference in Spanning Tree networks
  • Cyber Security enhancements, been ready for NERC CIP requirements
  • Support for IPv4 and IPv6 protocols (Multicast, Unicast and Broadcast operation)
  • Internal clock synchronization using NTP protocol
  • Operation as NTP server using IEEE 1588v2 as source of time
  • Alarm contacts for detection of critical events
  • Standard USB 2.0 configuration port

Cyber Security

The Reason S20 delivers advanced cyber security features

The Reason S20 delivers advanced cyber security features

The Reason S20 delivers advanced cyber security features that help operators to comply with NERC CIP guidelines and regulations. These features are standard with firmware 06A02 and greater.

AAA Server Support (Radius/TACACS+)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and their privileges within S20 devices. Multiple users account with independent passwords and privilege levels (roles) may be created, and with an advanced function leveling it is possible to define the access level required for each predefined function. Attempts to log-in (either successful or failed) are stored in a persistent flash memory syslog. After three failed log-in attempts, the user account gets locked out and must wait 1 minute to retry new three attempts.

Password Complexity, Encryption and Expiration

Factory default password is different for each manufactured device and after the first login, users must change the password with at least 8 characters including lower/uppercase alphabetic, numeric and special non alphabetic characters (e.g. #, $, @, &). Passwords are encrypted using SHA256 and by default, it may expire after 6 months (user-configurable).

Firmware digitally signed and secure communications

To perform a secure firmware update, S20 uses the checksum algorithm to check firmware integrity and a digital signature to ensure its authenticity. In addition, only the encrypted Secure File Transfer Protocol (SFTP) is enabled to transfer the firmware file. By default, only secure protocols such as SSH (CLI) and HTTPS (graphic web interface) are activated to establish remote access to S20, and if desired they may be deactivated as well as unused Ethernet ports, leaving only the local USB Serial communication through SSH available.


The flexible design of Reason S20 allows the user to customize each group of 4 ports interfaces to either electrical (RJ45 fixed/SFP) or optical (SFP), Fast Ethernet or Gigabit. In addition, S20 may have a redundant power supply which does not need to be identical to the main one. The power supply options are the full range high voltage 125-250 VDC / 110-240 VAC (50/60 Hz) or the low voltage 24/48 VDC.

Field proven design backed by extensive type testing to ensure the robustness of the S20’s fanless design for harsh substation environments. The EMC and Environmental tests are in accordance with IEC 60255-26, IEC 61850-3 Ed. 2, IEEE 1613 and its extension IEEE 1613.1. Safety requirements are in accordance with IEC 60255-27 and UL 60950-1.

flexible design - front and rear photos

IEC 61850 Networks

The Reason S20 is compliant with IEC 61850 for applications in substations, proven by an extensive type testing to demonstrate the EMC and environment robustness and a functional and performance test report issued by KEMA. The test scope included . The test scope included VLAN function, QoS function for GOOSE messages, network recovery performance (RSTP) and booting time. The Reason S20 UltraRSTP achieves a fault recovery time of less than 5ms per hop, reducing packets loss while maintaining interoperability with others standard RSTP devices. For zero recovery time, S20 is ready for PRP networks schemes.

Reason S20 operates either as a transparent clock or boundary clock to ensure time accuracy for PTP-aware IEDs in the network

Reason S20 operates either as a transparent clock or boundary clock to ensure time accuracy for PTP-aware IEDs in the network

IEEE 1588v2

Precision Time Protocol port

Precision Time Protocol (PTP) is defined in the IEEE 1588 standard, which describes the precision clock synchronization protocol for networked measurement and control systems. Reason S20 complies with IEEE1588v2, and can operate either as transparent clock or boundary clock to ensure time accuracy for PTP-aware IEDs in the network. All S20 interface ports may operate as PTP-aware, achieving the nanosecond accuracy given the hardware based implementation.

S20 clock flow

Reason S20 operates either as a transparent clock or boundary clock to ensure time accuracy for PTP-aware IEDs in the network

SFP Transceivers

If you have free SFP slots, or require replacing SFP transceivers, GE offers the following:




SFP Transceiver 1000Mbps LC single mode, 1310nm wavelength, 20km


SFP Transceiver 1000Mbps LC single mode, 1310nm wavelength, 40km


SFP Transceiver 1000Mbps LC single mode, 1550nm wavelength, 80km


SFP Transceiver 1000Mbps LC multi mode, 850nm wavelength, 500m


SFP Transceiver 100Mbps LC multi mode, 1310nm wavelength, 2km


SFP Transceiver 10/100/1000Mbps, RJ45 connector

A last-time buy has been announced for the following model until 8Th November 2023 subject to availability:


SFP Transceiver 1000Mbps LC single mode, 1550nm wavelength, 120km 


SFP Transceiver 100 Mbps LC single mode, 1310 nm wavelength, 20 km