RCD and difavtomat: main differences

What are RCDs and difavtomatov used for?

To protect a person from possible electric shock, for line protection against possible overloads and short circuits, electronic and electromechanical devices are widely used. The most commonly used RCDs (or VD - differential switch) and differential automata.

The difavtomat consists of 2 or 4 automatic switches and a differential protection unit.

What is the difavtomat intended for and How does he work, can be learned from video. If the electrical appliance falls into the water, the difavtomat will work and the circuit will be de-energized. The protection will work in case cable insulation damage. Instead of a difavtomat or in conjunction with it, you can use an RCD.

difference in purpose

Differences in device names. At the moment, many manufacturers, in order to prevent misunderstandings with the correct definition of device functions by its designation, use the front side or one of sides of the cover to print the name of the equipment, indicating that it is either an RCD or a difavtomat.

Marking. It is quite simple to determine which device is in front of you, for this you need to correctly decipher its marking

To determine that you have an RCD in front of you, and not a difavtomat, pay attention to its case, or rather to the information that is indicated on it: if there are no letters at the beginning of the marking, then this is a clear sign that this equipment is an RCD .

For example, for RCD VD-61, only the value of the rated current (16A) is indicated, while there is no letter with the type of characteristic. If there is a letter before the value of the rated current of the protective equipment, then this indicates that this equipment is a difavtomat. For example, the AVDT32 automatic difautomatic device has the letter C in front of the rated current, which indicates the type of characteristics of the releases present in it.

Schematic features.This way of finding differences will be relevant primarily for "advanced" users who are familiar with the basics of circuitry and are able to read the simplest connection diagram. So, if the diagram shows only a differential transformer that has a "Test" button, then you should know that only the RCD is marked in this way.

Purpose of residual current devices

The RCD protects the insulation of the electrical wiring and prevents the occurrence of a fire. And it protects a person from the effects of electric current when touching parts of devices that have phase voltage.

The RCD is triggered by an imbalance of currents in phase and neutral wires protected electrical network. This happens when insulation breakdown occurs and additional leakage appears. The flow of current through unsuitable materials may cause a fire. In buildings with dilapidated electrical wiring, fires from damaged insulation occur quite often.

Another dangerous case is touching the current-carrying parts of devices, which in the normal state should not be energized. The current begins to flow to the ground through the person, bypassing the neutral wire. In this case, the circuit breaker will not work, since it needs currents of at least tens of amperes to turn it off.

Dangerous for human life currents starting from 30 mA and above. The ability of the residual current device to respond to 10-30 mA is reliable protection from impact electricity. You should be aware that the RCD does not provide protection against overcurrents, this is the main difference between the RCD and the difavtomat.

In a situation where there is only an RCD and a short circuit occurs, the device will not react, and it may also burn itself out.Separately, without a circuit breaker, it is not used. If the question is what to choose - RCD or difavtomat - you need to understand that together with the RCD, you will definitely have to install a circuit breaker in the circuit.

The purpose of the differential machine

Difavtomat is used to protect the electrical network from overload, short circuit and leakage. In addition to the capabilities of the RCD, it performs the functions of a circuit breaker.

It happens that a person connects an extension cord with five, six additional sockets to one outlet, and through them connects several powerful devices. Under such circumstances, overheating of conductors is inevitable. Or, let's say, when the electric motor is turned on, the shaft is jammed, the winding starts to heat up, after some time a breakdown occurs, followed by a short circuit of the wires.

To avoid this, a difavtomat is installed. If the excess current is significant, then the difavtomat within a few seconds, without waiting for the insulation to melt, will turn off the line, thereby preventing a fire.

The speed of switching off the difavtomat depends on how many times the flowing current exceeds the rated current for a given line. If it is repeatedly exceeded up to a short circuit, the electromagnetic release is instantly activated.

If the current flowing through the line exceeds the rated current by more than 25%, then after about an hour the device will turn off the line, the thermal release will operate. If the excess is greater, then the shutdown will occur much earlier. The response time can be determined from the time-current characteristics given for each device.

The use of difavtomat and RCD

Depending on the purpose, certain protection devices are used.Patterns may vary. So, to control one line, it is reasonable to use a differential machine, and for several - the complex inclusion of RCDs and protective circuit breakers. However, the presence of space in the shield also limits the application.

If for a single line, connecting a differential machine does not create any particular difficulties, then installing an RCD for several requires special attention. Connect phase and neutral to the input of the circuit breaker. The output forms two power rails. All circuit breakers that protect against short circuits and overloads are connected to the phase wire. Accordingly, zero wires to the bus of the same name.

With or without earth

Differential machines are installed in networks with and without grounding. In the case of grounding, everything works perfectly - if problems arise, the phase and zero are turned off, and the "ground" wire is the current protection.

Grounding is always carried out with a separate wire

When using metal electrical panels, it is extremely important that the case is grounded, as there is always a chance that a potential will appear on it. If there is no grounding, touching the shield body will make you live

What happens next depends on what and what you stand for, what you hold on to, etc. In the presence of grounding, the potential will “leave” along the circuit of least resistance, and all that you will feel, in the worst case, is some kind of “hit”, but in general, rather sensations at the level of “pinching”. It is for this reason that the PUE insists on the presence of a working ground, because even a well-designed circuit without it is not completely safe.

What are the differences in the principle of operation of the residual current device and difavtomat

counter replacement

Outwardly, it is almost impossible to understand how an RCD differs from a residual current circuit breaker. They are similar, but perform different functions:

• Residual current device - comparing the amount of current suitable for the electric consumer and coming from it, the device determines the level of leakage. When the difference in current values ​​​​reaches life-threatening scales (on average, this is 30 mA), then the protective device will turn off the voltage. This not only saves a person from electrical injury when touching damaged equipment, but also effectively prevents a fire when the conductors are heated during a leak.
• Difavtomat is a unique design that combines an automatic machine and the already mentioned RCD. Thus, the differential machine provides protection for electrical wiring from overloads and short circuits, as well as from the occurrence of current leaks.

Generally, residual current device and working principle its circuitry protects against electric shock and wiring leaks accompanied by fire. Many users find that by installing this switch, they are completely protected. Not at all, this is not so, unlike the difavtomat, it is not able to protect the network from overload and short circuits.

Speaking in an accessible language, such a switching device monitors the presence of current leakage from the main consumers. When the insulation is damaged, the circuit will react and shut down the network. However, RCD has a number of disadvantages:

• When a number of powerful electrical consumers are simultaneously turned on, an overload is created, and the unit will not work.
• If you connect the phase and zero while the residual current device is operating, i.e.organize a large short circuit, then the device will also not turn off the network.
• When the "neutral" is disconnected, the element does not work, at this time there is voltage in the phase conductor, which is dangerous.
• The unit will not be able to work if the voltage in the network drops below the nominal value. The electronic type of devices is completely dependent on the availability of supply energy, their mechanism operates from a controlled network or an external power supply.

conclusions

The listed points are quite enough to understand how the RCD differs from the differential circuit breaker, without delving into the features of their design.

Summing up, it is important to note that the residual current device is not able to protect the network from a short circuit or overload. Therefore, it is always included in the circuit in series with a conventional machine, so that one component protects against leaks, and the second against short circuits and overloads.

Using difavtomat, you can get rid of the described situations. It is guaranteed to turn off the network when a person directly touches energized equipment. Damage to the insulation and contact of current-carrying lines with the housing also causes this switching device to operate.

What to put: difavtomat or RCD

Below we will briefly describe what both devices are, and also find out whether an RCD or a difavtomat, which one to choose from. In the meantime, let's dwell on the main selection parameters, which often act as restrictions. This is the price of the device, the inconvenience of connecting and, of course, the dimensions of the shield where you will install the device.

But the main criterion is still the goal: why this or that apparatus is installed. In particular, for security one consumer and one line, feel free to take a difavtomat.

At the same time, you need to remember that in the shield it will be necessary to provide quite a lot of space for additional protection. As you know, for RCDs, you must also install a circuit breaker, because. it does not have built-in overcurrent protection. It turns out that the machine requires one module-place, and for the RCD - three (the module itself is twice as thick). The same applies to connecting outgoing lines, the number of which also depends on the number of outlet groups.

At present, one-module difavtomats can already be found on sale, which are identical in their functions to conventional RCBOs: they have both an RCD and an automaton.

But AVDT has a feature when connected, because. involves the use of additional and very expensive tools such as press tongs, strippers and other tools that will reduce installation time.

Here, the “RCD + automatic” option looks more budgetary and convenient.

In general, after this information it becomes clear what is better when choosing difavtomat or ouzo.

Mounting.

Further, the installation of difavtomatov is easier to perform than the installation of an RCD + automatic machine. The difavtomat has two input terminals to which zero and phase are connected from the supply side, and two output terminals for connecting zero and phase to the load.

Installation and disconnection of the RCD and circuit breaker is a little more difficult, since the phase wire additionally passes through the terminals of the machine.

The use of difavtomatov instead of a bunch of RCD + machine simplifies installation and reduces the likelihood of errors when connecting, compared with connecting an RCD and a circuit breaker. With a large number of groups, the simplification of connection is felt even more.

Characteristics.

I want to note the equivalence of the proposed replacement of the RCD and the circuit breaker with a difavtomat

Studying the types and main characteristics of RCDs, I have repeatedly paid attention to the fact that, according to the design, RCDs are electromechanical and electronic. This is the fundamental point

If you are not in the know, then read the article RCD main characteristics in detail.

The fact is that these types of RCDs behave differently during emergency operation of the electrical network, in particular, when the neutral wire is broken from the side of the supply line.

What am I leading to? And to the fact that the difavtomat includes a differential protection module (i.e., part of the differential is an RCD) and all of the above fully applies to difavtomats.

And very often it happens that instead of an electromechanical RCD, which is operable and performs its protective function when zero breaks, a difavtomat with an electronic differential protection module is installed, which is not operable when zero breaks, because it contains in its design an electronic unit powered by the mains. In addition, electronic RCDs and differential automata are cheaper than electromechanical ones.

Many people who buy an RCD or a difavtomat do not even think about it, and the sellers in the store sometimes also cannot give a clear answer what type of device they are selling. I recommend that before you go shopping to the store, carefully study the article How to check the type of RCD?

Also, many modern electrical appliances have complex control circuits, which, in the event of an insulation breakdown, in addition to sinusoidal leakage currents, can also create pulsating DC leakage currents.In such situations, it is desirable to use Type A differential protection rather than the commonly used AC type. Type A devices are more expensive and harder to obtain.

This must also be taken into account when replacing the RCD with a difavtomat. If you have an automatic machine and an electromechanical RCD of type A, and you are replacing it with a difavtomat with an electronic differential module. protection type AC - a replacement, at least not equivalent.

Therefore, when replacing a bunch of RCD + automatic machine with a difautomatic device, it is necessary to take into account the main characteristics and type of devices for an equivalent replacement.

The difference between an RCD and a differential machine

Let's figure it out in detail according to individual specificationshow the RCD differs from the difavtomat and how you can use the advantages of each of them.

We note the main difference that the RCD does not protect the network from overload and short circuits. That is, it acts solely as an indicator by which current leakage is controlled.

If all electrical appliances are connected to the network at the same time and an intentional overload is created, protection device will not work, and the differential circuit breaker will instantly de-energize the network, preventing ignition and melting of the insulation.

Watch this video on YouTube

Let's take a closer look at the devices themselves and then it will become clear how to distinguish an RCD from a difavtomat externally:

• The marking of the rated operating current of the electromagnetic release is one of the key differences between the RCD and the difavtomat (only the difavtomat has it). The case must indicate the operating current (with the letter - C16, C32) and the leakage current. If only one parameter is indicated or without a letter, then this is an RCD - it indicates the magnitude of the leakage current and the switching capacity of the contacts.
• the wiring diagram on the device - similar circuit diagrams are shown on the case, on the RCD diagram it is an oval denoting a differential transformer and an electromechanical relay. On the diagram of the second device, thermal and electromagnetic releases are additionally applied.
• the name on the device case on the side - is applied not on all devices;
• abbreviation on the device - on devices of domestic manufacturers, VD (differential switch) or RCBO (residual current circuit breaker) is indicated.

It is important to note that the reliability of operation differs little, the main differences are in the operation time and the operation of two types of special releases in the difavtomat. The disadvantage of the latter is the impossibility of determining what caused the operation: network overload, short circuit or leakage

The advantage of AVDT is the combination of two devices in its case. In the switchboard there is an additional place for a single-pole machine. However, in the event of a breakdown, a full replacement will be required. The residual current device occupies two places, since it must be connected complete with the machine. This equipment simplifies the repair process in case of failure - only one element must be replaced.

Watch this video on YouTube

How to distinguish an RCD from a difavtomat visually

Everything is quite simple here, although the two devices are very similar to each other. First of all, the RCD immediately on the front side a powerful knife switch, an indicator and a "Test" button are visible. Secondly, on the RCD on the case, the current marking is indicated in large numbers, for example, 16A.

If at the beginning of the inscription there are Latin letters B, C or D, and then there is a number, then you have a differential automaton. For example, before the current strength 16 is the letter "C", which means the type of characteristic of the electromagnetic and thermal releases.

Price.

Everything is simple here. Usually the cost of a bundle of RCD + circuit breaker is lower than the cost of one difavtomat.

Yes, there are exceptions when the cost of a difavtomat is lower. But this is rare and mostly refers to non-famous brands. In my practice, I work with well-known proven brands, and their differentials are much more expensive.

When installing a bundle of a circuit breaker and an RCD, in the event of a failure of one of these protection devices, it is enough to replace the faulty one with a new one, whether it is an RCD or an automatic device. At failure of its difavtomat must be replaced with a new one and the cost of such a replacement is usually more expensive than a separate RCD or machine.

In most cases, buying a bundle of RCD + automatic machine is cheaper than a difavtomat, and with a large number of groups in the shield, it can significantly save the budget. In the event of a failure, replacing an automatic or RCD is cheaper than replacing a difavtomat.

SUMMARY.

We see that there is no specific answer to the question: “RCD or difavtomat? What to choose? What's better?"

In each specific case, depending on the goals pursued and the priorities set, the choice may outweigh the combination of RCD + automatic, or towards the use of a difavtomat. What factors influence this, I examined in detail and outlined above.

See a detailed video RCD or difavtomat? What to choose?

In conclusion, I recommend watching a few videos in which various options and schemes for the use of RCDs and difavtomatov are considered in detail.

Video Diagrams for connecting difavtomatov and RCD. Part 1:

Video Diagrams for connecting difavtomatov and RCD. Part 2:

Recommended materials on the topic:

RCD circuit breakers difavtomat - a detailed guide.

How to choose circuit breakers, RCD, difavtomaty?

Automatic switches - design and principle of operation.

The device of the RCD and the principle of operation.

Difavtomat device and principle of operation.

Difamat - main technical characteristics.

Connecting difavtomatov and RCD for collaboration

To connect the RCD, grounding is required, the difavtomat can be operated without grounding.

The order of joint installation:

1. Determine the phase of the difavtomat.
2. Mount both devices on the mounting rail.
3. First of all, connect the phase wire to the machine (black wire in the diagram).
4. Connect the wire coming out of it (brown) to the upper phase terminal of the RCD.
5. Connect the neutral wire (blue) directly to the RCD.
6. Connect the line to the consumer to the lower terminals of the RCD.
7. After installation, check the functionality of the machine. On its body there is a "Test" button. After clicking on it, the consumer should turn off.

the phase wire is connected to the RCD through a difavtomat

Experts recommend checking the performance of devices at least once a month.

If you plan to provide protection for several lines, for example, 6, then in order to save money, you can use 3 RCDs and 3 double difavtomat.

one RCD is paired with 2 difavtomat

6 consumer lines are connected to terminals 1-6.

The video shows the sequence of work on the installation of an apartment electrical panel, lists the necessary tools and materials. Shows how to distribute groups of consumers. Security advice given.

Video: assembling a shield for an apartment

It must be remembered that no device guarantees 100% protection. Therefore, safety rules should always be followed.

Experts advise using narrow-profile devices. But for reliable protection, they recommend the combined use of an RCD and a difavtomat. This will create a comprehensive protection of power supply circuits from overloads, short circuits and electric shock to a person. Allows you to quickly determine the cause of the operation.

The combined use of both devices will be more expensive than one of them, but human safety is worth it.

And now we will figure out how the differential automaton or ouzo differs by external signs

There are four main external differences:

• rated current marking;
• electrical circuit;
• name - imprint on the body of the device;
• abbreviated inscription on the device.

Well, let's start with the first: one of the differences between an ouzo and a difavtomat is current marking. The main characteristics of the RCD are the rated current in amperes and the setting of the leakage current. Such characteristics are basic and are indicated on the body of the device, i.e. on the front panel.
Main characteristics of the circuit breaker - this is the rated current and time - a characteristic of the response speed during overload. This characteristic is indicated by the letter rating before the rated current.Naturally, if an RCD and a circuit breaker are present in the design of the difavtomat, then the markings of these devices should be on the body of the difavtomat.

The way it is. In our case, if only a number is indicated on the case, for example 16A, this is an RCD. The largest current that an RCD can withstand for a long time, while maintaining its stable performance and protective functions. Displayed on the front panel. The value of the rated current, which is determined by the cross section of the wires and contacts used inside the RCD and the design of its power contacts.

If on the front panel of the device there is also a letter in front of the number, for example B, C or D (example C16), then this is nothing more than a differential machine.

Now let's move on to the electrical circuit. For an uninitiated person, these schemes are a “dark forest”, so we will not go into details of what exactly is depicted there. Let's just focus on the main points.

On the RCD diagram - the main elements of the operation of the device: a differential transformer is indicated by an oval, reacting for leakage currents and opening electromechanical relay.

On the difavtomat diagram, in addition to the designations that are available on the RCD, the designations of the thermal and electromagnetic disconnectors that respond to overload current and short circuit.

Now, looking at the diagrams of these two devices, you can easily determine what is in front of you, and you can easily figure out how the RCD differs from the differential machine.

What is better to choose

This question is very popular. at the initial stage electrical production. Most consumers are of the opinion that the difavtomat has more advantages in relation to the RCD.Because it performs the functions of not only an RCD, but also an automatic machine, but this is an erroneous opinion. If we consider the cost of these two devices, then the difavtomat costs more than the RCD. However, it should be borne in mind that the RCD must be installed together with the machine. Therefore, the cost of such two mechanisms is much higher than the difavtomat.

RCD and automatic or difavtomat

If we consider protective devices for reliability? This criterion is equal to them even when occurrence of an emergency they will work the same. The differences may be in the quality of the services offered. Due to different manufacturers. In the switchboard, the difautomatic takes up less space than the RCD together with the machine, since the RCD is recommended to be installed only together.

Due to the above properties of protective aggregates, there is no specific answer to this question. Based on the pros and cons, you can choose a suitable remedy. It is also worth considering the power consumption in the home. In this case, it is better to consult a specialist.

Differences between RCD and difavtomat

So, let's see how RCDs and difavtomats differ.

Functionality

Everything seems to be clear with this: the RCD only protects against current leakage, and the difavtomat protects both from leakage and from exceeding the current strength in excess of the permissible value (overload or short circuit).

Appearance

A more interesting question is how to distinguish one device from another visually? Both of them are quite similar, in particular, both of them have a "TEST" button (checking the performance of the RCD module).Dimensions also, most likely, will not say anything: if before, difavtomatov were always larger than RCDs, today they either have the same dimensions, or even are more compact. For example, the RCD of the VD1-63 series and the difavtomat of the AVDT32 series of the budget Russian manufacturer - the IEK company - look almost the same.

Modern models of RCDs and difavtomatov one manufacturer look very similar

Well, let's take a closer look.

Name

First of all, of course, you should look at the name, if, of course, it is written on the case. On the RCD they can write "RCD" or "Residual current switch", but most often they depict the abbreviation "VD" - a differential switch.

Most manufacturers are starting to label their residual current circuit breakers with the letters "RT"

The full name of the difavtomat sounds like this: a circuit breaker controlled by differential current. Accordingly, the abbreviation "AVDT" is usually applied to the body of such a device.

The abbreviation "AVDT" is usually applied to difavtomatov

Diagram on the body

This identifier is universal, as it helps to understand even if the name is written in a foreign language or is completely absent. Each device schematically displays its device, so that with some experience it will not be difficult to recognize it:

1. RCD - the circuit of the apparatus will depend on its type. On the simplest, electromechanical RCD, the user will see a minimal set of components: an oval element indicates the most important part - a differential transformer. The connection of the "TEST" button is also displayed.

2. For an electronic RCD, an additional element will be visible in the diagram - an amplifier board, which is usually indicated by a triangle. As you can see, power is supplied to the amplifier.

3. One of the variants of the RCD circuit will be depicted on the body of the difavtomat, and in addition to it, the release windings.

The circuit on the body of the difavtomat includes a differential transformer, a "TEST" button and releases - electromagnetic and thermal

Marking (rated current)

Nominal current is the maximum current, which the device can pass through itself for a long time. This characteristic is necessarily indicated on each device, but in slightly different ways:

• only a number is written on the RCD, for example, "16 A";

• on a difavtomat, there is a letter in front of the number, for example, "C16 A".

The letter in front of the value of the rated current on the body of the difavtomat indicates the characteristic (breaking capacity) of its releases. On household models, you can usually see the letters "B" (for circuits without an inductive load, usually lighting), "C" and "D" (can withstand inrush currents typical for networks with connected electric motors).

There are also difavtomatov with the letters "A" (for networks with long conductors), "K" (used if almost the entire load - 80% - is inductive) and "Z" (for low-current networks, where even short-term overloads are unacceptable). They are mainly used in industry.

Criteria for selecting electrical protection devices

Let's try to figure it out which is better for at home - RCD or differential machine, and consider various installation situations.Most often, the choice is influenced by factors such as the position of the device in the electrical panel, the nuances of connecting to power lines, the possibility of maintenance or replacement.

Features of installation in the electrical panel

The electrical panel is a metal box, inside of which protection devices and an electric meter are usually located. The working panel to which the instruments are attached is limited in size.

If there is an improvement in the power grid and at the same time additional modules are installed, then there is a shortage of free places on DIN rails. In this case, difavtomatov are in a winning position.

Scheme of location on the din-rail of pairs "automatic + RCD" (top row) and difavtomatov (bottom row). Obviously, lower devices take up less space. The difference will increase if the protection is designed for more circuits.

Modern equipment of apartments with electricity is focused on increasing the number of circuits. This is due to the emergence of a large number of powerful equipment, and to the division of the network into many lines. In such a situation, in the absence of additional space, the only reasonable solution is to connect difavtomatov.

When selecting devices, pay attention to devices that occupy one module-place. Such models have already appeared on sale, but their cost is slightly higher than that of traditional ones.

Difficulty in wiring

The main difference between the connection between the two indicated options is the number of wires. Two separate devices in total have more terminals - 6 pieces, while the difavtomat has only four. The wiring diagram is also different.

Comparative installation and connection diagram protective pair and difavtomat.The result of operation in an emergency and the reliability of the devices is the same, but the order of connecting the wires is different

The diagram shows the wiring well.

When connecting a pair of AB + RCD, the layout is as follows:

• the phase wire is connected to the AB terminal;
• the jumper connects the output of the machine and the L-terminal of the RCD;
• the output of the RCD phase is sent to electrical installations;
• the neutral wire is connected only to the RCD - at the input with an N-terminal, at the output - it is sent to electrical installations.

With a difavtomat, the connection is much easier. Jumpers are not needed, only the phase and zero are connected to the corresponding terminals, and the outputs are sent to the load.

What does this give the installer? Facilitates the connection process, reduces the number of wires, respectively, guarantees more order on the electrical panel.

How is the operation diagnostics performed?

If we consider devices from middle price segment, then here the advantages of the tandem "automatic + RCD". Suppose there was an emergency power outage on one of the circuits.

It is difficult to immediately determine the cause of the protection operation, since it can be a leakage current, a short circuit, and the total load that the wires could not cope with.

By a triggered RCD or machine, you can immediately see where to look for the cause. In the first case - an insulation problem, in the second - an increased load or short circuit. The latter can be determined by additional features

If a difavtomat reacted to a network failure, then the cause will have to be looked for longer. It is necessary to check all versions, and this will take more time and effort.

To simplify diagnostics, it is recommended to purchase devices from a more expensive price segment - they are equipped with additional indication, indicating a possible problem.

What appliances are cheaper to buy and fix?

There are situations where the choice is based on cost. For example, there is a budget that cannot be exceeded. In this case, the total cost of all connected protection devices plays a decisive role.

At first glance, a larger number of devices is characterized by a higher price. In fact, everything is different: a universal difavtomat costs a round sum, and a set of other devices turns out to be economical.

If you monitor the price tags of all the designated machines, it turns out that one difautomatic machine is almost twice as expensive as the “AV + RCD” set

It should be remembered that the number of lines is usually 3 or more, so the difference between purchases grows. If for one circuit the purchase of a RCBO is only 1 thousand rubles more expensive, then for five circuits the difference in amounts grows to 5 thousand rubles.

Thus, both difautomats and RCD units with automatic switches have their advantages and disadvantages. If RCBOs win in compactness and ease of connection, then they clearly lose in diagnostics and cost accounting.