Switchgears 0.4 kV

Distribution Devices 0.4 kV

Distribution devices 0.4 kV (RU-0.4 kV) are used for receiving, accounting, and distributing electric energy with a nominal alternating three-phase voltage of 380 Volts and a frequency of 50 Hz. The RU-0.4 kV ensures the protection of electrical lines from various overloads and short circuits.

These devices are usually located in close proximity to power sources, such as power step-down transformers, from which they receive electric energy and distribute it among consumers. The main installation locations for RU-0.4 kV include administrative, residential, and industrial buildings, transformer substations (TP), and distribution points (RP).

Construction of Distribution Devices 0.4 kV

The construction of RU-0.4 kV includes the following elements:

  • Incoming panels: Designed for connection to the power transformer (busbar or cable), protecting busbars and the transformer from short-circuit and overload currents, indicating the presence of voltage, operating the automatic backup power supply (AVR), and organizing commercial accounting of electric energy.
  • Distribution panels: Used for protecting outgoing electrical lines from short-circuit and overload currents, performing operational switching, and organizing commercial accounting.
  • Sectional panels: Allow for the sectioning of different busbar systems within one RU-0.4 kV and the operation of AVR in automatic mode.
  • Auxiliary panels: Used for controlling and managing capacitor banks, lighting systems, as well as for meeting the internal needs of the electrical installation.

The enclosures of RU-0.4 kV are made of sheet metal coated with paint, which provides the following advantages:

  • high mechanical strength and electrical conductivity;
  • resistance to temperature fluctuations over a wide range;
  • long service life;
  • reliability and ease of maintenance.

All RU-0.4 kV panels have a connection for fastening busbars and grounding wires, which is a necessary requirement of the electrical installation rules (PUE).

Maintenance and operation of RU-0.4 kV can be carried out from one or both sides, depending on the type of panels. RU-0.4 kV may also have various degrees of protection (IP), which determines their resistance to external factors such as dirt, moisture, dust, and others. In addition, distribution devices can differ in climatic performance types, allowing for their operation in conditions of various climatic zones, including in tropical climates and at the far north.


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