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Siemens’ new F-gas-free ring main unit sets new standards for climate-friendly power distribution

The new F-gas-free Clean Air Ring Main Unit 8DJH 24 extends the Siemens blue GIS portfolio to 24 kV level and has integrated sensors and communications interfaces to higher-level automation and the Internet of Things (IoT) systems.

“We set new standards by offering a completely fluorine gas free ring cable switchgear for voltages up to 24 kV. This new development enables our customers to make power distribution sustainable and at the same time future-proof,” said Stephan May, CEO of the Distribution Systems Business Unit at Siemens Smart Infrastructure. “At Siemens, we believe that the only right technological approach is to replace fluorinated gases completely. That’s why we’re eliminating not only the climate gas SF6, but all F-gases and chemical additives.” 
Siemens developed the new ring main unit for use in public and industrial power grids at the secondary distribution level. Areas of application include secondary, transfer and switching substations of energy providers, as well as industrial and infrastructure facilities. 
With the new development, Siemens is bringing environmentally friendly and future-proof power distribution to the broader market. Load-break switches on the secondary distribution level with line voltages of up to 24 kV account for approximately 80 percent of all installations in Europe. At the same time, the trend toward distributed energy systems is leading to an increased need for optimized control, monitoring and utilization of distribution grids. In addition to the high level of environmental compatibility, digital applications make the new switchgear future-proof and cost-efficient to meet the requirements of decentralized grids. The ring main unit can be remote-controlled, offers communications capabilities and can be connected to IoT platforms such as MindSphere, the cloud based, open IoT operating system from Siemens, as well as other systems. 
The new 24 kV load-break switchgear expands the sustainable blue GIS switchgear portfolio from Siemens. All products are free of fluorinated gases and use climate-neutral Clean Air insulation as well as vacuum technology. The first switchgear for primary technology for line voltages up to 12 kV was launched by Siemens in 2018 as type 8DAB 12. This was followed in spring 2019 by variant 8DJH 12 for the secondary distribution level. The NXPLUS C 24 unit with a rated voltage of 24 kV was introduced in spring 2020. As a next step, Siemens plans to complete its fluorine gas-free medium-voltage portfolio with products up to the 36 kV voltage level. These new developments will feature Clean Air insulation, vacuum technology and all the proven benefits of gas-insulated switchgear. 

The new F-gas-free 24 kV ring main unit 8DJH 24 has been in use since fall 2020 in a local substation in the Oberallgäu region of Germany as part of a development cooperation with German distribution grid operator Netze BW.

You can find more information about our environmentally friendly switchgear and how it works in our press feature:
We cordially invite you to participate in the Siemens Digital Enterprise Virtual Experience at Hannover Messe from April 13 until 15, 2021. Experience products, solutions, and concrete application examples in an almost real 3D environment. Save the date now! You can register here:
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For more information about our blue GIS medium-voltage switchgear, see
For more information about Siemens Smart Infrastructure, see

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Siemens Smart Infrastructure (SI) is shaping the market for intelligent, adaptive infrastructure for today and the future. It addresses the pressing challenges of urbanization and climate change by connecting energy systems, buildings and industries. SI provides customers with a comprehensive end-to-end portfolio from a single source – with products, systems, solutions and services from the point of power generation all the way to consumption. With an increasingly digitalized ecosystem, it helps customers thrive and communities progress while contributing toward protecting the planet. SI creates environments that care. Siemens Smart Infrastructure has its global headquarters in Zug, Switzerland. As of September 30, 2020, the business had around 69,600 employees worldwide.
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Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for more than 170 years. Active around the world, the company focuses on intelligent infrastructure for buildings and distributed energy systems and on automation and digitalization in the process and manufacturing industries. Siemens brings together the digital and physical worlds to benefit customers and society. Through Mobility, a leading supplier of intelligent mobility solutions for rail and road transport, Siemens is helping to shape the world market for passenger and freight services. Via its majority stake in the publicly listed company Siemens Healthineers, Siemens is also a world-leading supplier of medical technology and digital health services. In addition, Siemens holds a minority stake in Siemens Energy, a global leader in the transmission and generation of electrical power that has been listed on the stock exchange since September 28, 2020.
In fiscal 2020, which ended on September 30, 2020, the Siemens Group generated revenue of €57.1 billion and net income of €4.2 billion. As of September 30, 2020, the company had around 293,000 employees worldwide. Further information is available on the Internet at
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Silke Federspieler

Siemens AG

+49 174 1551579