In electrics and energy, the decoding of the abbreviation ASU is an input-distribution device, sometimes it is also called UVR. Without this element of the electrical circuit, one cannot do in the power supply of residential buildings and public buildings. Today, ASU is a closed steel box, which contains a large number of devices used to control and account for electricity, as well as protect connected consumers. In this article we will tell you why you need an input-distribution device, what it consists of and what it can be equipped with.

Purpose and scope

The ASP is mainly used for the reception and subsequent distribution of electrical energy. In addition, this element is designed to protect consumers connected to it from overloads, short circuits, current leaks and other emergencies. It should also be noted that input distribution devices are used to account for the consumed electricity, as well as to control the correct distribution of the load throughout the electrical network. Well, it should definitely be noted that with the help of a switchgear installed at the input, operational switching on and off of equipment that is connected to this section of the circuit can be made.

The photo below shows what it looks like:

In short, the main purpose of the input distribution device is to combine in one place control and protective equipment, as well as devices necessary for measuring and accounting for electrical energy. Thanks to this, all devices can be compactly assembled at the facility and controlled from one place, protected from adverse weather conditions and other hazards.

As we said above, the ASU is used not only in administrative buildings and industrial enterprises, but also in residential buildings (private and multi-apartment). When drawing up a power supply project, the location of the input distribution device is indicated, as well as the characteristics of all the equipment that will be installed in it. According to the project, it assembles the ASU and further seals the electricity meter.

In a private house, the ASU is used if it becomes necessary to distribute the load over several buildings (bathhouse, utility block, garage, summer kitchen, etc.). In this case, the main ASU is installed, after which it is necessary to install an individual switchgear for each individual building.

ASU equipment

Input-distributing devices can be equipped in different ways, depending on the wishes of the customer and existing requirements. Basically, ASUs in the electrical industry are equipped with protective automation, an electrical energy meter, measuring equipment and tires.

If we talk in more detail about the components of the ASU, they are as follows:

• Electric meter.
• Introductory circuit breaker and introductory RCD.
• Group circuit breakers and RCDs (or difavtomatov).
• Tires (grounding, zero, conductive).
• Wires and cables necessary for switching all equipment.
• Type-setting terminal blocks for switching circuits.

In addition, depending on the field of application of input distribution devices, they can be equipped with current transformers, quartz fuses, voltage limiters, voltmeters, ammeters, arresters, protective equipment and other devices. As already mentioned, the configuration of the ASP depends on the power supply project and the individual preferences of the customer.

Types of input distribution devices

The last thing I would like to talk about in this article is what types of ASU are. So, conditionally, we divided them into the following varieties:

1. By rated current: 100, 250, 400, 630 A.
2. By type of execution: suspended, floor.
3. By appointment: introductory, distribution, input-distribution.
4. Place of installation: indoors and outdoors. It is important to indicate here that the degree of protection can be from IP31 to IP65.
5. By type of service: one-sided, two-sided.
6. By the number of inputs: for 1 input or for several (2, 3, 4).

It is important to note that the switchgears themselves can be one-, two-, three-panel and more (multi-panel). The dimensions of the box also depend on its configuration and scope.