What is ASU and what is it for?

Purpose and scope

Mostly ASU serves 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 emergency situations. It should also be noted that the input and 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 be noted that with the help of a switchgear installed on the input, on-line switching on and off of equipment that is connected to this section of the circuit can be performed.

The photo below shows how it looks:

In short, the main purpose of the input-distribution device is to combine in one place the control and protective equipment, as well as the devices necessary for measuring and accounting for electric 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, 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, as well as the characteristics of all the equipment that will be installed in it, are indicated. According to the project, the ASU is assembled and further sealed with an electricity meter.

In a private house, ASU is used if it becomes necessary to distribute the load across several buildings (bathhouse, utility unit, 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.

Options ASU

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

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

• Electric meter.
• Introductory circuit breaker and introductory RCD.
• Group circuit breakers and UZO (or difavtomaty).
• Tires (grounding, zero, conductive).
• Wires and cables necessary for switching all equipment.
• Stackable terminal blocks for switching circuits.

In addition, depending on the field of application of the distribution and distribution devices, they can be equipped with current transformers, quartz fuses, voltage limiters, voltmeters, ammeters, dischargers, protective equipment and other devices. As already mentioned, the complete set of the switchgear 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 kinds 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. At the place of installation: indoor and outdoor. It is important to indicate here that the degree of protection can be from IP31 to IP65.
5. By type of service: one-way, two-way.
6. By the number of inputs: for 1 input or for several (2, 3, 4).

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

The marking of the ASU makes it clear what characteristics this device has. The abbreviation is deciphered as follows:

Finally, we recommend watching the video, which describes in more detail how the water management system is arranged:

That is where we end our article. We hope that now it has become clear to you what the input-distribution device is for and what options exist. We hope the information provided was useful and interesting for you!