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Live tank circuit breakers

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Over
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live tank circuit breakers in use in 140 countries


for applications from 72.5 kV to 800 kV, up to 80 kA.

Do you have any questions? Are you looking for more information about our live tank circuit breakers? We have experts to assist you with any issue.
Ask our experts

Product overview

Overview of our live tank circuit breakers

We offer our live tank circuit breakers for applications from 72.5 kV to 800 kV, up to 80 kA. Depending on the requirement, you can choose from live tank circuit breakers with three-pole (one drive for three poles) or single-pole (three drives for three poles) operation, as well as from porcelain or composite insulators. Our live tank circuit breakers are suitable for all different types of applications, from use in extreme temperatures to earthquake regions. In these circuit breakers, the interrupter unit is not grounded during operation – it is exposed to high voltage.

Main features:

  • For applications from 72.5 kV to 800 kV, up to 80 kA
  • Spring drive mechanism (3AP) or electrohydraulic operating mechanism (3AT)
  • Self-compression principle (≤ 245 kV) or dynamic self-compression principle (≥ 245 kV)
  • Available with single- (FI, FE) or three-pole operation
  • Suitable for temperatures from -60 up to +55°C
  • Available with porcelain or composite insulators
  • Seismic withstand capability up to 0.3 g or 0.5 g
  • Gas leakage rate of less than 0.1 % per year
  • Type tested according to the latest international standards

Advantages:

  • Easy installation and commissioning: only few subassemblies
  • Inspection after 12 and maintenance after 25 years
  • 10,000 switching operations are guaranteed
  • Service life of up to 50 years
  • Over 107,000 circuit breakers delivered worldwide prove our best practices and years of experience
  • Minimal transportation costs
  • 24-hour service hotline
  • Our global production network saves customers time and transportation costs

Our live tank product families

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3AP circuit breaker family from 72.5 kV to 800 kV

Our high-voltage live tank circuit breakers are available for three-pole operation with a common base (FG), for single-pole operation also with a common base (FE) or for single-pole operation with separate bases (FI). 3AP1 circuit breakers up to 300 kV are equipped with one interrupter unit per pole and 3AP2 circuit breakers up to 550 kV include two interrupter units. The circuit breakers can be equipped with optional closing resistors (3AP3) for applications from 362 kV to 550 kV. The 3AP4 includes 4 interrupter units per pole and can also be delivered with closing resistors on request (3AP5).

Technical Data

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All values in accordance with IEC, other values on request
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3AT circuit breaker with double-nozzle system

The 3AT circuit breaker with double-nozzle system is especially suitable for special applications, such as the restrike-free interruption of low inductive and capacitive currents and the interruption of all types of short-circuits up to 80 kA, as well as HVDC applications.

Technical data

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All values in accordance with IEC, other values on request.
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3AV circuit breaker with vacuum technology

The new generation of high-voltage circuit breakers is based on over 40 years of experience in the production of medium-voltage vacuum interrupters and over 5.5 million units delivered.

Siemens has introduced this proven technology to high-voltage power networks above 72.5 kV and has been gaining operational experience in European networks since 2010.

 

Most important characteristics and advantages:

 

  • Technology based on 40 years of experience and 5.5 million delivered vacuum tubes
  • Perfect for low temperature applications 
  • Completely type-tested acc. to latest international standards
  • Maintenance free and low operational costs throughout the entire lifecycle due to “sealed for life“ interrupter unit; minimum efforts for gas handling
  • No CO2e (equivalent) emissions
  • Switch medium (vacuum) with greenhouse potential (GWP) = 0
  • No CO2e emissions during operation, maintenance or recycling
  • No emission or emission compensation costs throughout the service life

Technical data

Rated voltage
kV
72.5
145
Vs. SF6 breaker 145 kV
Number of guaranteed operations
at rated short-time withstand current (40 kA)
  30 30 10-12
Number of interrupter units per pole   1 1 1
Rated break time   2cycle (50 Hz) 2cycle 3cycle
Rated normal current, up to A 3150 3150 3150
Rated short-time withstand current, up to kA 40 40 40
Rated short-circuit breaking current, up to kA 40 40 40
Rated frequency Hz 50 / 60 50 50 / 60
Rated power-frequency withstand voltage kV 160 275 275
Rated lightning impulse withstand voltage kV 350 650 650
Rated duration of short-circuit s 3 3 3
Rated peak withstand current (2.7 p.u.) kA 108 108 108
First-pole-to-clear-factor p.u. 1.5 / 1.3 1.5 / 1.3
1.5 / 1.3
Capacitive voltage factor p.u. 1.7 1.4 1.4
Temperature range °C -60 up to +55 -60 up to +55 -30 up to +55
Maintenance after   12 years visual inspection
25 years visual inspection
up to 10,000 operations at 3150 A
12 years visual inspection
25 years visual inspection
up to 10,000 operations at 3150 A
12 years visual inspection
25 years revision
up to 6,000 operations at 3150 A
Insulating medium   Clean Air Clean Air SF6
Amount of SF6 / CO2 equivalent / Global Warming Potential   0 / 0 / 0 0 / 0 / 0 9,2 kg / 209,760 kg / 209,760
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Vacuum interrupters

Siemens has over 40 years of experience in producing medium-voltage vacuum interrupters and delivered more than 5.5 million units.

Siemens introduced this proven technology to high-voltage power networks in 2010. The hermetically sealed vacuum interrupters are reliable and maintenance free thanks to its “sealed for life” technology.

 

 

The most important characteristics and advantages:

High performance

  • Suitable for frequent switching: high number of short circuit interruptions with excellent switching features over the entire service life of the vacuum interrupter

 

Perfect for low temperatures

  • Switch medium does not liquefy

 

No CO2e (equivalent) emissions

  • Switch medium (vacuum) with greenhouse potential (GWP) = 0
  • No CO2e emissions during operation, maintenance or recycling
  • No emission or emission compensation costs throughout the service life

 

 

Downloads, support and services

Our services for you

You can find details on our live tank circuit breakers and information about our services here.

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

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Testing laboratories at Schaltwerk Berlin

We test components at our accredited testing laboratories.

Testing laboratories at Schaltwerk Berlin
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Technical simulations

Numerical simulation and analytical calculation methods for efficient product development.

Technical simulations

Contact

Bestseller, trendsetter or power pack

You can find the right live tank circuit breaker for your applications to meet your requirements.