Development and manufacturing of low-voltage
and high-voltage electric equipment

10 Chelyabinskaya Str., Ozersk, Chelyabinsk region, 456783, Russia
Phone: (35130) 4-36-40; fax: (35130) 4-87-15; e-mail:
Sales department. Phone: (35130) 4-82-45, 4-17-79; fax: (35130) 4-46-83; e-mail:

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Front side access switchgears of KSO-203 series

Камеры сборные односторонненего обслуживания серии КСО-203 напряжением 6(10)кВ
Front side access switchgears of KSO-203 series (figure 2.8), designed in accordance with Technical Conditions 3414-041-32574607-2003, are intended for reception and distribution of three-phase alternating current of industrial frequency of 50 and 60 Hz and voltage (6)10 kV in networks with insulated neutral or in networks with neutral earthed through ground-fault neutralizer. KSO-203 panels have a rate of protection at the front and lateral surfaces - IP20, and from other sides - IP00 (in accordance with GOST 14254-54) and are used in indoor switchgears.

The metal housing of the panels of KSO-203 series is produced on modern hi-tech equipment and is sprayed by resisting powder epoxy paints with electrostatic method. The panel design and removable doors allow placing various equipment, and it is easy to be removed and installed or replaced with the similar equipment. Thus, there is the installation compatibility with the panels of KSO-292 and KSO-298 series. All these advantages allow to increase considerably life cycle of the product, at the same time having reduced time and expenses for its operation and service.

KSO-203 panels fully comply with the requirements of state safety standards and have the certificate of conformity № РОСС RU.ME25. B01361.

Operation conditions

Ambient temperature from minus 10 up to plus 40°С for climatic modification UHL3.1 is in accordance with GOST 15150-69.

Altitude above sea level is no more than 1000 m.

KSO-203 panels are not intended for operation in atmosphere contaminated by gases, evaporations and chemical depositions harmful to insulation, and also in explosive and fire-risk environments.

Delivery conditions

Заказ камер КСО-203 осуществляется по опросному листу. По требованию заказчика возможно изготовление камер по нетиповым схемам и комплектация любым, в том числе и импортным, оборудованием.
Number of the main circuit diagram given in table 2.6, represents the structure of symbolic notation of a particular modification of the main circuit diagram: Х1Х2А-Х3Х4, where

Х1 - serial number of the main circuit diagram;

Х2 - symbol for high-voltage circuit-breaker (if available): VBP - the Saratov vacuum circuit-breaker with a spring magnetic drive; VBEM - the Saratov vacuum circuit-breaker with an electromagnetic drive; TЕL - the vacuum circuit-breaker with an electromagnetic drive, magnetic "lock" and telemechanics;

А - automatic switching (if available);

Х3 - rated current of the panel, in amperes;

Х4 - designation of the basic components (if available): TSN - auxiliary transformer; TN - voltage transformer; RVO, RVD - arrester type, OPN - overvoltage suppressor.

When ordering it is necessary to specify a particular modification of the main circuit diagram.

The example of KSO-203 panel symbolic notation when making an order:

KSO-203-8VBEM-630 OPN-UHL3.1 - the panel of KSO-203 series with the main circuit diagram number 8, with vacuum circuit-breaker and electromagnetic drive, with the main circuit rated current 630 A, with overvoltage suppressors, climatic modification UHL, category of installation 3.1.

Panels are completed with electric equipment of rated voltage 6 and 10 kV: power transformers, arresters, power protection devices, power transformers.

Typical versions of KSO-203 panels are determined by a particular diagram of the main and auxiliary circuits and by rated parameters of built-in devices.

Design and action

The panel represents a metal frame, welded of bent steel sections. Inside the panel there are two compartments with the main circuit components. On the front side there are disconnector drives and blocking buttons, connected to the vacuum circuit breaker. Indication of the circuit-breaker position is realized by indicators located on KSO-203 front side. Bus isolator is installed above the compartments. Collecting buses are placed on support insulators.

Access into the circuit-breaker, voltage transformer or protection device zones of the panel is provided through the higher door. Access into the cable connections, power transformer, arresters and disconnecters zones of the panel is provided through the lower door. Between the door with the auxiliary circuits devices and the circuit-breaker the removable protective screen, preventing access into the high voltage zone, is installed. The lower door and protective screen have sight holes to watch the equipment without de-energizing.

On the front side of KSO-203 panel there is a tilting yoke on which the switch and indoor lighting lamp of voltage 36V are installed. Outside there is a filament lamp of 220V for the front side of KSO-203 illumination. Exterior lighting of the panels is switched on outside KSO-203.

Collecting buses and bus disconnector of KSO-203 panel  have a cage on its front side.

The frame of the panel is directly welded to earthed metal structures.

Auxiliary circuits

The higher door is a plane on which the scheme of auxiliary circuits is mounted. On the front side of the door there are the devices with rear connection to wires (protection, control and indication relays, counter and microprocessor devices).

The scheme of auxiliary circuits can be produced both on electromechanical relays, and on microprocessor devices (BMRZ, SIRIUS, SЕРАМ, SPAC).
Control circuits can be used with :

  • direct current;
  • alternating current;


In panels with high-voltage circuit-breakers the following kinds of protection can be applied:

  • maximum current protection (МCP);
  • current cutoff (CC);
  • protection of minimum voltage (PMV);
  • protection against single-phase ground short circuit (SGSC);
  • protection against overload;


In order to prevent erroneous operations while servicing panels, according to GOST 12.2007.4-75, the following interlocks are designed:

  • mechanical interlock, preventing disconnectors on and off with the circuit-breaker on;
  • mechanical interlock between main and grounding circuits of disconnectors, preventing grounding blades on with the disconnector  working blades on, or disconnector working blades on with grounding blades on;
  • mechanical interlock, preventing the input circuit-breaker on with grounding blades on;
  • electromagnetic interlock, preventing earthing switch on provided that in other KSO-203 panels, from which voltage supply to the main circuit segment of the panel with earthing switch is possible, switching devices are in "on" position;
  • electromagnetic interlock, preventing, with earthing switch on, activation of any switching devices in other KSO-203 panels, from which voltage supply to the main circuit segment of the panel with earthing switch is possible;
  • electromagnetic interlock, preventing earthing switch on in the sectionalising panel with bus disconnector, with the sectionalising circuit-breaker on.

Note - Electromagnetic interlocks are produced at request of the consumer according to the diagrams of auxiliary circuits in KSO-203 panels. At request it is possible to install safety locks on the doors of KSO-203.

In KSO-203 panels earthing switches with lockable drives can be used.

There is also an auxiliary panel both detached, and with panels with auxiliary transformers.

The design of KSO-203 panels provides all panels being assembled in a row for the main circuits connection by both collecting, and line buses. At two-row arrangement bus bar bridges with disconnectors and without them are used for connection by collecting buses. The design of high-voltage inputs provides both cable, and bussing connection.

Have you got any questions? Call or come to us. Highly qualified
skilled consultants will help you to find optimal
decision for your business!
10 Chelyabinskaya Str., Ozersk, Chelyabinsk region, 456783, Russia
Phone: (35130) 4-36-40; fax: (35130) 4-87-15,
e-mail:, site:,