What is the maximum voltage for a circuit breaker?

Siemens Energy offers high voltage circuit breakers that can handle voltages up to 1100 kV

How are high-voltage circuit breakers tested for reliability?

Circuit breakers are tested on several ways before leaving factories to ensure the safe and reliable operation. Testing routines are different, depending on the product type.

What are the common maintenance issues with high-voltage circuit breakers?

Circuit breakers offered by Siemens Energy are mainteance free for up 25 years.

How do high-voltage circuit breakers differ from medium-voltage ones?

They differ in voltage ratings, applications, design compexity and in several operational characteristics. Medium voltage ranges up to 66 kV, high voltage as above 72,5 KV

How do HVDC circuit breakers differ from AC circuit breakers?

HVDC circuit breakers are specifically designed to handle the unique challenges of direct current systems, while AC circuit breakers are optimized for alternating current applications.

What is the difference between a circuit breaker and a vacuum circuit breaker?

Vacuum circuit breakers operate by interrupting the current within a vacuum chamber and are known for their compact size and reliability. Other circuit breakers use different insulating mediums, air, oil or gas and different interrupting technology.

High-voltage circuit breakers I reliable protection

Since 2010, Siemens Energy F-gas-free breakers have set new standards, allowing you to meet environmental regulations while maintaining optimal performance. With a well-proven modular platform concept, our high-voltage circuit breakers are adaptable to your specific requirements, ensuring they can handle extremely high voltage levels effectively.

By selecting our circuit breakers, you are investing in a solution that not only meets your operational needs but also supports your commitment to sustainability and efficiency.

Leading the switch to SF6-free switchgear

Circuit breaker type	Voltage range	Key features
Live tank circuit breakers	72.5 kV to 800 kV	Modular design, single- or three-pole operation, option for porcelain or composite insulators, optional closing resistors
Dead tank circuit breakers	72.5 kV to 550 kV	Up to 90 kA interruption, 2-cycle operation, common or separate bases, optional closing resistors, flexible current transformer solutions
Dead tank compact (DTC)	Compact variant	Space-saving design with similar operational flexibility and reliability
Disconnecting circuit breakers (DCB)	Specialized type	Combines switching and disconnecting functions, reduces substation footprint, simplifies system design

The Blue portfolio

To decarbonize the energy industry, it's essential we make the transmission of power as clean and green as its generation. This means eliminating climate-hostile SF6 gas from electrical switchgear as soon as possible.

Our Blue portfolio, based on clean air and vacuum switching technology, provides a viable, reliable and already available alternative. Zero F-gases, zero toxicity and zero harm to human health and the environment. Find out more about the future-ready Blue portfolio.

Vacuum interrupters form the backbone of our 3AV1 Blue portfolio. Based on more than 40 years of experience in medium-voltage range and more than 6 million delivered vacuum interrupters, Siemens Energy has introduced this proven technology to high-voltage power networks in 2021. This game-changing technology offers several advantages:

Zero C02 or F-gas emissions
Hermetical tightness to protect from decomposition products
High switching performance without degradation
Zero maintenance (sealed for life)
Perfect for low temperatures, no liquefaction of switching medium
Low risk of breakage due to flexible sheds

Advantages:

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

The PSD control unit reduces overvoltages and protects electrical equipment. Energizing and re-energizing during an autoreclosing operation of shunt compensated transmission lines cause switching overvoltages on the transmission lines. The design is based on more than 15 years of experiences with controlled switching. This includes applications such as capacitor bank and reactor switching, energizing of transformers and uncompensated transmission lines up to 1100 kV.

Features:

Single and three-phase auto-reclosing
Unrestricted parameter-definable software
Standard close and open-trigger circuits
Two switching procedures can be specified at the same time
Compensation function for temperature & coil voltage influences
Secure current measurement with “ring-type transducers”
Station communication protocol , IEC 61850 / DNP3
Evaluation using graphical user interface
Switching history can be transferred
Cyclic history, alarms, measurement values
For standard switching and controlled switching of transmission lines

The SiCEA01 contact erosion analyzer is used to determine the extent of wear to the circuit breaker contacts. The breaking currents of the circuit breaker are used to determine the contact wear. Switching operations with currents below the rated normal current are evaluated with the rated normal current. The contact burn off is calculated using the integral of the circuit breaker breaking currents. The result is compared with the configured reference values. If the result of this comparison exceeds the warning or alarm value, the corresponding signal contact is activated, and the signal light on the contact wear analysis device shows the status. With this warning or alarm, SiCEA01 shows whether the circuit breaker contact system has already been worn down to a specific level, which allows servicing work to be scheduled in good time.

Features:

Device for determination of contact wear
2 limits (warning and alarm), adjustable in % of the maximum
permissible contact wear
Digital relays and LEDs for warning and alarm
Calculation of the integrated current during open operation for three poles
Ambient temperature from -40 up to +85 °C
Communication via Ethernet
Input: 3 x analog input for signal of protection current transformers with external AC transformer 100A/100 mA; 3 x digital input reference contacts; auxiliary contacts
Output: 3 relay outputs (warning, alarm, system OK); 3 LEDs

Increased transparency and performance with Sensgear®

Function: Seansgear is our digital monitoring solution for switchgear and circuit breakers. it collects key data - including gas density, temperature conditions, switching operation count and breaker position - and transmits this securely to a cloud platform where it can be viewed and analyzed in real time from any location. This visibility empowers you to make better-informed decisions, optimize performance and reduce operational costs.

Features:

real-time monitoring
comprehensive data analytics
GPS and local weather information as well as product-specific measurment data
data sent via encrypted connection to the cloud platform
enhanced productivity
faster diagnostics and troubleshooting
enables proactive maintenance to minimize downtime

Service

First name

Last name

Phone number

Company name

Country/region

Job role

Is your inquiry related to installed equipment?

Yes No

Industry (Select up to three)

Please let us know how we can help you

Marketing consent

A high voltage circuit breaker is an electrical device designed to protect high voltage power systems by interrupting the flow of electricity during fault conditions, such as short circuits or overloads. It operates by detecting abnormal current levels and quickly opening the circuit to prevent damage to equipment and ensure safety. The mechanism typically involves a combination of mechanical and electrical components, including a trip unit that senses faults, and a switching mechanism that physically opens the circuit, using gas, oil, or air as an insulating medium.

Bringing Zero closer: high-voltage circuit breakers

Overview and applications

Leading the switch to SF6-free switchgear

Explore our types of high voltage circuit breakers

Let's take a closer look on our circuit breakers!

Live tanks and disconnecting circuit breakers

Dead tanks and dead tank compact

The Blue portfolio

Technical specifications and features

Aspects of technology we use

Circuit breaker accessories

Increased transparency and performance with Sensgear®

Service

Downloads

Brochures and flyers

Flyers US only

Get in touch with us

Get answers: FAQs on circuit breakers

Bringing Zero closer: high-voltage circuit breakers

Overview and applications

Leading the switch to SF6-free switchgear

Explore our types of high voltage circuit breakers

Live tanks and disconnecting circuit breakers

Dead tanks and dead tank compact

The Blue portfolio

Technical specifications and features

Aspects of technology we use

Vacuum interruption principle

Self-compression principle

Stored-energy spring drive mechanism

Circuit breaker accessories

Service

Brochures and flyers

Flyers US only

Get in touch with us

What is a high voltage circuit breaker and how does it work?

What is the maximum voltage for a circuit breaker?

How are high-voltage circuit breakers tested for reliability?

What are the common maintenance issues with high-voltage circuit breakers?

How do high-voltage circuit breakers differ from medium-voltage ones?

How do HVDC circuit breakers differ from AC circuit breakers?

What is the difference between a circuit breaker and a vacuum circuit breaker?

Circuit breakers insights