Reliable, sustainable and customized solutions

Securing and synchronizing currently more than 80 GW of electricity production
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Generator switchgear

Unrivalled technology - Made in Germany

0 MW

Power range

up to 110 kA short-circuit rating and 15,000 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

are 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 and 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

World of Electrification and Automation – Global Summit March 2022

The most reliable and sustainable vacuum generator circuit-breaker (up to 450 MW)

Generator Circuit-Breakers are key components to improve the reliability and protection of power plant. Thanks to SF6- and maintenance-free vacuum technology, they reduce the CO2 footprint and operational cost of your power plant!


Benefit from increased eco-transparency

EcoTransparency for eco-friendlier energy. With EcoTransparency, Siemens provides full transparency in power grid products, systems, and solutions. Innovative “blue” products, compliance with environmental standards, and documentation of environmental performance help you protect the climate.

Sustainable and reliable

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. 


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 / reduce the carbon footprint and the operational expenditure of your power plant. 

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

Key references

Discover some of our key references