High performance for the power supply of tomorrow

Developed from more than 40 years of experience in vacuum switching technology
Download the ICEPE best paper award winner 2017 on vacuum circuit-breakers for pumped-storage power plants

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Unrivalled technology Made in Germany

0 MW

Power range

up to 100 kA short-circuit rating and 12.500 A nominal current, answering most generator assets protection and grid synchronization requirements

0 years

Experience in vacuum technology

Reliable and durable solution together with a reduction of greenhouse gas emissions


Vacuum generator breakers in use in 57 countries

for retrofit and new power plant projects 

Product information

When reliability meets sustainability

Generator Circuit-Breakers (GCB) are key components to improve the reliability and protection of your paramount power unit equipment such as generators and step-up transformers. Their installation leads to higher power plant selectivity, increased availability, together with simplification of the operational procedures and a reduction of the overall costs. With Siemens, your retrofit and new power plant projects will be supported by one of the most experienced partner in Generator Circuit-Breaker solution. Dedicated to deliver durable & reliable solution, Siemens has been systematically advancing generator switchgear with vacuum switching technology providing our customer with proven SF6- and maintenance-free vacuum technology.
Customer Event

GBS Experts Talks - The exceptional customer experience

An exclusive selection of customers, including different power generating industries, Utilities, EPCs, Consulting and scientific partners had the opportunity to discuss and share technical knowledge with the generator circuit-breaker experts in Berlin about the advantages of vacuum switching technology. At the 2-day event the customers learned more about the short-circuit calculations, the manufacturing process and had the chance to participate at different factory tours.

Recap of Expert Talks 2019


Technology leader

All our generator switchgear portfolio is equipped with vacuum circuit-breaker, the proven and reliable Siemens switching technology with no gas-handling! The air insulated, metal-encapsulated design consists of materials that are completely recyclable.

Sustainable and reliable

Siemens HB3 is the world’s first and only vacuum generator circuit-breaker for power plant applications above 150 MW. It benefits from an unrivalled technology to optimize the carbon footprint and the operational expenditure of your power plant. 

The proven and trusted HB3 solution belongs to the “blue”-portfolio of Siemens for energy and environment protection.


Our solutions tailored to customer requirements

We are systematically further developing our extensive portfolio of high-current and generator switchgear in the range up to 400 MW in order to meet your application needs and ever new market requirements at all times. Explore some of our success stories.

Further information

The paper “Vacuum Circuit-Breakers – Promising Switching Technology for Pumped Storage Power Plants up to 450 MVA” was awarded with the Wang Jimei Best Young Investigator Paper Award at the International Conference on Electric Power Equipment – Switching Operation 2017 in Xi’an (China).


Get in contact with our Customer Service:

You can contact us 24/7. We are looking forward for your call or online request. Phone +49 180 524 70 00