Dead Tank circuit breakers 110...550 kV

High-voltage Dead Tank circuit breakers with spring mechanism and internal SF6 insulation for outdoor installation in networks with voltages from 72.5 to 800 kV. The operation of SF6 switches is based on driving the mechanism using springs, which are wound using a motor drive, and also, in the absence of operating voltage or emergency situations, manually. High-voltage Dead Tank circuit breakers built on this type of drive are capable of performing various functions of interrupting current (load) in various electrical networks and are rightfully considered one of the most reliable.

Tank-type SF6 circuit breakers are capable of absorbing the significant rate of current rise resulting from short-term power line faults, as well as high peak loads arising from asynchronous switching. Small inductive or capacitive currents, such as the charging current of an overhead or cable power line, the charging current of capacitor banks, the magnetizing current of a transformer or shunt reactor, are interrupted without any overvoltage.

Another advantage of this type of switches is the presence of built-in current transformers. This solution allows you to significantly reduce the construction area of substations due to its compact dimensions.

Switches comply with IEC, GOST, ANSI standards.

By design, SF6 high-voltage circuit breakers, depending on the area of application, are divided into two types:

  • Switches with three-phase control;
  • Switches with single-phase control.

The SF6 tank circuit breaker consists of three main parts:

  • Poles with porcelain or polymer outer insulation, consisting of a support insulator and an arc chute;
  • Spring drive;
  • Frame and supporting struts;
  • Built-in current transformers;
  • Heating elements for switch operation at low negative temperatures.


  • Rated primary voltage from 35 to 550 kV
  • Rated current from 800 to 4000 A
  • Rated short-circuit breaking current from 31.5 to 80 kA
  • External insulation porcelain or polymer
  • Environmental conditions: temperature -45° to +55°
  • Compliant with IEC and IEEE standards or equivalent standards


  • Simple and compact design
  • The installation height of the circuit breaker can be made according to customer specifications
  • Robust arc chute design
  • High seismic resistance
  • Easy to install
  • Maintenance of the operating mechanism is possible without dismantling the circuit breaker
  • No need for additional adjustments during installation
  • Low operating noise levels