Circuit breakers

We offer live tank and dead tank circuit breakers as well as hybrid solutions combining different functions in a compact design, such as our Dead Tank Compact (DTC) and our Disconnecting Circuit Breaker (DCB). All of our products are manufactured based on our proven modular design and are available with porcelain or composite insulators.

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Product overview

Our circuit breaker technology

The technology of our products sets international trends. We continuously ensure our high quality through optimized production processes, constant product development and a certified quality management system.

Advantages:

  • Over 100 years of operating experience
  • Many years of experience with special applications, e.g. in extremely hot and cold temperatures, or in the event of earthquakes
  • Close customer contact and quick accessibility thanks to our global production network and 24-hour service
  • A strong platform concept for interrupter units and operating mechanisms ensures competitive prices as well as low maintenance and training costs
  • Everything from a single source: installation, maintenance, training, technical advice
  • Replacement parts and maintenance accessories for all Siemens Energy circuit breakers available for at least 25 years after delivery
  • Extremely low gas leakage rate of less than 0.1% per year (IEC requires a maximum of 0.5% per year)
  • All Siemens Energy breakers have a 12 year inspection / 25 year maintenance cycle, minimizing your total cost of ownership! No adjustments or maintenance to the operating mechanism are required for life of the unit

Modular design

All Siemens Energy high-voltage circuit breakers are designed in a well proven modular platform concept. This leads to a wide variety of breaker types and strong flexibility with regard to various applications according to our customers’ requirements as well as high availability at eminently competitive price. 
 

The main components, such as the operating mechanism, control system, base frame, kinematic chain and insulator designs are identical and based on decades of manufacturing and operating experience – and are also used in our GIS switchgear range.

Quenching principle

Our complete 3AP family up to 800 kV and above relies on our arc-quenching principles, either the self-compression or the dynamic self-compression principle using the thermal energy of the arc. Siemens patented this method of arc quenching in 1973 and has continued to develop the technology of the self-compression interrupter unit ever since.

Stored-energy spring drive mechanism

The drive concept of the 3AP circuit breaker family is based on the patented stored-energy spring principle. The mechanism types differ in terms of the number, size and arrangement of the opening and closing springs. Both the opening and closing springs are located inside the operating mechanism, thereby achieving a simple and sturdy device.

 

Advantages of the stored-energy spring mechanism:

  • Same principle for rated voltages from 72.5 kV up to 800 kV
  • High reliability thanks to low operating energy (10,000 operating cycles guaranteed)
  • Reliable, economical and durable due to uncomplicated and robust construction with few moving parts
  • Controllable switching state at all times
  • Easy access to springs as they are not integrated in SF6 compartments
  • Maintenance-free for 25 years or 6,000 operation cycles

Composite insulators

Characteristics of composite insulators:
  • Low risk of breakage due to flexible sheds
  • Easy installation
  • Lightweight
  • Safety in the event of short circuits and earthquakes
  • No cleaning of silicone housing necessary
  • Resistant to environmental influences and pollution
  • Decades of operational experience with long-rod insulators,  surge arresters and circuit breakers
References

Global service

As a leader in the global market, we deliver circuit breakers that meet the differing environmental, technical and economic conditions in more than 150 countries around the world.
Downloads and services

Our services for you

You can find informational materials on our circuit breakers and details about our services here.

We can gladly help you with installation, commissioning, diagnostics and malfunctions

More information

Proven expertise and top quality

Siemens Energy circuit breakers deliver customized solutions, the latest technologies and decades of development experience from a single source. Do you have any questions? Are you looking for more information about our circuit breakers? We have experts to assist you with any issue.