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Siemens’ innovative switching principle paves way for sustainable F-gas-free power distribution 

An innovative load-break switch equipped with a special vacuum interrupter is the new centerpiece for F-gas-free medium-voltage applications in secondary distribution grids from 12 to 24 kV.

All switching operations, such as turning off medium-voltage systems for maintenance, produce arcs that must be quenched as quickly as possible. In its F-gas-free medium-voltage systems, Siemens relies on millionfold proven vacuum technology where the arc is quenched in a sealed vacuum interrupter. This core technology has been used in premium vacuum circuit breakers for 40 years. For systems of the secondary distribution grid level that distribute power in the local grid and mostly only handle load switching tasks, the conventional circuit breakers in use are typically oversized and cost-intensive.
In the new and innovative load-break switches, the vacuum interrupters have the task to quench the arc within a few milliseconds. For this purpose, they are integrated into a separate current path and can be kept extremely compact. Furthermore, a new load-break switch has been developed which is a true three-position switch. The proven principal of the switch-off, disconnect and earthing functions used in SF6 load-break switchgear is continued. As a result, the safe user operation remains unchanged for the Siemens F-gas-free systems.
This new and innovative load-break switch with a vacuum tube is also available in combinations matching it with fuses, using F-gas-free technology. This allows the many transformers in secondary distribution grids to be protected with fuses as usual. 
“Because the operation and compact design of the new blue switchgear remains the same, we’re making the switch to climate-neutral power distribution easy and safe for our customers,” said Stephan May, CEO of the Distribution Systems Business Unit at Siemens Smart Infrastructure. “The load-break switch allows us to boost switching performance. This significantly increases the electrical service life and paves the way for the connection of larger transformers, with which the increasing energy demand on the consumer side can be covered in the future.”
For further information on Siemens Smart Infrastructure, please see  
For further information on Siemens blue GIS, please see

The new load-break switch is a true three-position switch. The proven principal of the switch-off, disconnect and earthing functions used in SF6 load-break switchgear is continued.

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, and has around 72,000 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 2019, which ended on September 30, 2019, the Siemens Group generated revenue of €58.5 billion and net income of €5.6 billion. As of September 30, 2019, the company had around 295,000 employees worldwide on the basis of continuing operations. Further information is available on the Internet at

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Anna Korb

Smart Infrastructure

Freyeslebenstr. 1
91058 Erlangen

+49 9131 173 663 7