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Siemens New Generator Circuit-breaker Offers Advanced Customization

Siemens HB3-Compact


November 15, 2019

Siemens HB3-Compact generator circuit-breaker

With its HB3-Compact generator circuit-breaker, Siemens provides a unique generator circuit breaker solution to the most challenging constraints. Offering more customization options, the generator circuit-breaker can be mounted either vertically or horizontally, and its phase-to phase spacing and phase height axis can be adjusted to match perfectly to the existing busbar connection points. The circuit-breaker can also be fitted with integrated line disconnecting switch and earth disconnecting switch on generator side and/or on transformer side. These features make it especially valuable for retrofit applications in power plants, where the highest security of supply is crucial, and space is limited due to existing installations.

With the increasing percentage of renewable power, reliable protection technology is needed to handle higher voltages resulting from temporary higher power infeed, for example. Generator circuit-breakers are key components for improving the reliability and availability of power plants. They protect equipment such as generators and transformers against overload or short circuiting by disconnecting and connecting them from and to the grid.
With its adaptable design and installation, the new HB3-Compact model offers power plant operators the greatest degree of flexibility when designing a new plant or replacing outdated equipment. It has a simplified footprint, which facilitates the designing and dimensioning of the switchgear. The supporting frame design can be customized, meaning the phases can be fitted in one common or an individual frame design to enable splitting of the phases, for example when installing in different rooms. 
Besides this flexibility in design, HB3-C also supports plant operators in saving costs during project implementation and operation. Thanks to the unit’s compact size, its transport, erection and commissioning are simplified and outage times for the installation of a new circuit-breaker can be kept to a minimum. The maintenance-free vacuum switching technology used in the switchgears eliminates the need for gas handling, guarantees minimum maintenance costs and increases the recycling rate of the HB3 systems. The HB3-C is part of the Siemens Blue Portfolio, combining high-tech performance with environmentally safe materials and work procedures.


  • Highly compact design
  • Up to 75% OPEX savings due to vacuum technology performance
  • Up to 110 kA breaking capabilities
  • Up to 15,000 A rated nominal current
  • Up to 24 kV rated nominal voltage
  • Maintenance-free up to 10,000 interrupting cycles at current of 15 kA 
  • Vertical and horizontal installation
  • Common and individual supporting frame design
  • Can be delivered with integrated line disconnecting switch, earth disconnecting switch on generator side and/or transformer side
  • Based on proven HB3 generator platform with vacuum switching tech


More information on the HB3-Compact generator circuit-breaker

HB3-Compact generator circuit-breaker flyer

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