The Main Distribution Board (MDB) is designed for receiving and distributing electrical energy in three-phase power networks with nominal voltages of 380 and 220 volts of alternating current at a frequency of 50 Hz. This device also includes elements for protection against overloads and short circuits.
The MDB is a prefabricated metal structure consisting of several functional elements:
Automatic circuit breakers, load switches, and various automation elements are used for arranging sectional and incoming panels. One of the key elements of the sectional panel is the automatic transfer switch (ATS), which is implemented based on modern microprocessor devices with logic controllers. The ratings and characteristics of the circuit breakers are selected depending on the parameters of the consumers who will receive electrical energy from the MDB. Often, metering devices are installed on the incoming panel, which monitor the consumption of electrical energy directly at the first switching device.
The MDB is used to create a reliable power distribution network in administrative, residential, industrial, and other buildings and structures. These boards provide optimal protection against various deviations from the normal operating mode.
Main distribution boards are classified by the following parameters:
When purchasing a main distribution board, it is important to consider the technical solutions for its installation. Depending on the installation location, there are outdoor and indoor MDBs, which differ in their degree of protection (IP) against external environmental influences such as humidity, mechanical damage, dust, and dirt. Additionally, the configuration of outdoor MDBs includes switching devices and automatic devices that can withstand sharp temperature changes and increased humidity.
Depending on the type of installation, MDBs can be wall-mounted, built-in, or floor-mounted. The most powerful and responsible sections of the electrical network are made using floor or built-in versions of MDBs.
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