Which voltage stabilizer to choose for a private home: professional advice and a review of the best brands

Product Rating

In the process of selecting a reliable voltage corrector, it is recommended to study the reviews and reviews on the forums, as well as the ratings of specialized publications. As practice shows, inexpensive Chinese devices are often of poor quality and the declared characteristics do not correspond to the real ones.

It is also important to know that electrical networks in European countries do not experience critical voltage amplitude fluctuations, so their main production is directed to the countries of the former Soviet Union.

Up to one kilowatt

Such devices are very popular, as many consumers buy a device for only one device. The places were distributed as follows:

1. Quattro Elementi Stabilia 1000 is a relay stabilizer manufactured in Italy. Its active power is 600 W, and the operating voltage is from 140 to 270 V. The device has a turn-on delay, during which the input voltage is tested for safety of use. The efficiency of the normalizer is 98%. The only drawback of the device is the low accuracy of the output voltage of 8%, but this does not prevent it from being used with any household appliances in the apartment.
2. Powercom TCA-2000 is compact: its dimensions are 123x136x102. Produced in Taiwan. Built-in protection against overload, short circuit, high-voltage surges. Belongs to the relay type. The operating voltage range is 176-264 V. The output power is one kilowatt. The error does not exceed 5%. Judging by the reviews, most often such a device is purchased to work with the boiler.
3. Resanta ASN-1000 / 1-Ts - the stabilizer corrects the input voltage with an error not exceeding 8 percent, and ensures operation in the range of 140–260 V. In the event that the parameters go beyond these limits, the device is guaranteed to turn off the load. The response speed is no more than 20 ms, and the correction is 50 V / s. Withstands the load, the total power of which does not exceed 0.8 kW. It works on the principle of voltage boost, which is implemented by means of a step autotransformer.

More than 10 kW

Such devices are designed to connect a whole group of devices to them. Usually they can be located both on the wall and on the floor, and have an informative display. In the rating "Voltage stabilizers for the house 10 kW" the following models are in the top three:

1. Eleks AMPER 12-1/50 11 kVA is a triac normalizer, to which you can connect a load with a total power of up to 11 kW. It has protection against overheating, high and low voltage, short circuit, overload. The corrected signal accuracy is 3.5% and the response time is 20ms. Conversion loss is less than 3%. Cooling active.
2. RUCELF SRWII-12000-L - serves to protect the load, the total power of which does not exceed 12 kW. It features a compact body and a large information display showing the input and output voltage. In addition, it has an adjustable turn-on delay from 5 seconds to 5 minutes. It has built-in temperature control and intelligent cooling control function. Type of work - triac.
3. Energy Voltron 10000 (HP) is a single-phase device that can be used both for summer cottages and for a private house. The principle of stabilization is relay. Manufacturer - Russia.Launch delay - from six seconds to three minutes. The output deviation does not exceed five percent. Built-in overcurrent protection. Provides power to the load when the input voltage changes in the range of 95–280 V. The connection is made through the terminal block.

Rating of the best voltage stabilizers

Nomination	place	Name of product	price
The best relay voltage stabilizers (power up to 1 kW)	1	RESANTA LUX ASN-1000N/1-Ts	2 860 ₽
	2	Wester STB-1000	2 999 ₽
	3	Quattro Elementi Stabilia 1000	1 809 ₽
	4	Powerman AVS 1000D	1 780 ₽
The best relay voltage stabilizers for 5 kW	1	Wester STB-5000	7 499 ₽
	2	RUCELF SRWII-6000-L	9 050 ₽
	3	RESANTA ACH-5000/1-Ts	6 190 ₽
The best relay voltage stabilizers for 12 kW	1	RUCELF SRFII-12000-L	15 714 ₽
	2	Wester STB-10000	11 999 ₽
	3	RUCELF SRWII-12000-L	16 257 ₽
The best ultra-precise stabilizers for gas boilers	1	PROGRESS 8000SL	58 600 ₽
	2	Leader PS10000W-50	46 700 ₽
The best electromechanical voltage stabilizers up to 10 kW	1	RUCELF SDWII-12000-L	19 397 ₽
	2	RESANTA ACH-10000/1-EM	15 040 ₽
The best electronic voltage regulators	1	BASTION SKAT STM-20000	43 000 ₽
	2	Energy Classic 7500	26 500 ₽
best double conversion voltage regulator	1	Stihl IS1500	12 949 ₽
The best hybrid voltage regulator	1	Hybrid SNVT-6000/3	29 700 ₽

Voltage stabilizer HYBRID E 9-1/40 v2.0

Number of phases:	single-phase
Power:	9 kW
Working current:	40 A
Number of stabilization steps:	9
Key type:	hybrid
Operating range:	110-325V
Stabilization Accuracy:	7,5 %
Reaction time:	100ms
Bypass:	electronic
Guarantee:	2 years
Series:	Hybrid

19.980 rub.

The range of stabilizers for summer cottages is not limited to the Hybrid series, but this device is ideal for this purpose, both because of its simplicity and unpretentiousness, and due to the most affordable price and highest reliability.

Who needs a voltage stabilizer?

1. Residents of country houses, summer residents, as well as those living in rural areas. Fluctuations in power grids located far from the city are not uncommon.
2. Residents of city apartments, if there are problems with voltage stability. Serious fluctuations can produce noise in the speakers and on the screens, flashing lights, changing the sound of the refrigerator and washing machine. Less significant differences can be detected with a multimeter. Measure the voltage at the outlet at the peak of electricity consumption (in the evening, for example) and at minimum consumption (working day). Tolerance - 10%, i.e. for a 220 V network, the voltage can be 198-242 V. If the fluctuations are more significant, then it's time to think about buying a voltage stabilizer.

A voltage stabilizer is an adapter between a source of electricity and all electrical appliances. It is able to increase/decrease the voltage, or turn off the power supply in case of too low (less than 160 W) or high (more than 255 W) voltage

When choosing a voltage stabilizer, it is important to consider a lot of factors.

What should be considered when choosing and buying a stabilizer?

There are several criteria on the basis of which a decision is made to purchase a particular voltage stabilizer. Of course, you can just buy the most expensive and most powerful device, but if you only need to connect one device, then why overpay for unnecessary functions?

Single-phase devices are suitable for domestic conditions. Three-phase stabilizer models are used to power industrial equipment.

When selecting devices, the following criteria should be taken into account.

Power

This is the most important indicator that you need to pay close attention to. In fact, it represents the maximum power that will be required to run a particular device.

It is measured in watts.

Distinguish between rated and maximum power. The refrigerator compressor motor draws peak current at startup. Therefore, when buying a stabilizer, you need to choose one that has a significant power reserve. The rated power is always indicated in the passport of the refrigeration unit. If it is impossible to find it, then you can roughly calculate it. The rated power is taken as a basis in the range of 150-200 W for a single-chamber refrigerator, 200-400 W for a two-chamber refrigerator. These readings must be divided by 0.65 and multiplied by 3. The resulting value will be the peak power for a particular refrigeration unit.

When choosing a voltage stabilizer, you need to take a small margin both up and down. 20% will be enough. Such power will be sufficient both with a decrease in the voltage in the network, and with an increase. The refrigerator will function stably for a long time and without breakdowns.

Working range

Another important characteristic of the stabilizer is the operating range of the input voltage of the device. Everything is simple here - the wider it is, the better. As a rule, there are models with a range from 100 to 260 V, from 120 to 300 V. Sometimes you can find devices with a range from 70 to 330 V. When choosing, you need to rely on the need of a particular electrical network.

Performance

A high-quality stabilizer should produce a sufficient processing speed for voltage indicators.There is no need to buy an ultra-fast device, no matter how the sellers of equipment insist on it. The speed of the device should be just enough. The required response time is capable of delivering all modern stabilizers.

A simple example will help you understand what speed we are talking about. 20 milliseconds fit 50 Hz. This is just one period of light tension. The electronic control unit of the refrigerator for such a short period simply does not have time to "catch" the power surge and respond to it.

Reliability and security

Since the refrigeration units operate continuously, the stabilizer must also be as reliable as possible. If the device has a very attractive price, but the build quality is questionable, it is better to refuse the purchase. The fact is that such devices rarely pass the necessary certification. As a result, the output power declared in the passport may not correspond to the real one. Not only the voltage stabilizer itself can fail, but also the protected refrigeration unit.

Price

The cost of certain types of stabilizers varies significantly. It varies from 4,000 rubles and above. You can choose Chinese-made devices that will be significantly cheaper, but their quality work is not guaranteed. Connected household appliances, for the stable operation of which a stabilizer was purchased, may also be at risk.

Based on the foregoing, we conclude that it is necessary to carefully approach the choice of a voltage stabilizer. A poor-quality device can quickly fail and lead to a breakdown of the refrigerator. In this regard, you should not chase the cheapness of the device. It is better to give preference to more reliable models.It will not be superfluous to read reviews about a particular voltage stabilizer before buying.

It is also important to remember that you do not need to buy a stabilizer with a huge supply of peak power. Because of this, the cost of the device can increase significantly.

Power stabilizer selection

Power is the main characteristic of the stabilizer, according to which it is chosen. It is quite clear that the power of the stabilizer should be slightly greater than the total power of all consumers. Thus, before choosing a voltage stabilizer, you need to correctly determine the total power consumption of the devices to be protected.

It should be borne in mind that the power consumption is divided into active and reactive, which make up the total power consumption of the device. Typically, devices indicate active power consumption (in watts, W), but depending on the type of load, reactive power should also be taken into account. Thus, when calculating the power of the stabilizer, you must take into account the total power consumption, which is measured in volt-amperes (VA).

• S is the total power, VA;
• P is active power, W;
• Q is reactive power, VAr.

The active load is directly converted into other types of energy - light or heat. Heaters, irons, and incandescent lamps are examples of devices with a purely resistive load. Moreover, if the device has a power consumption of 1 kW, then a 1 kVA stabilizer is enough to protect it.

Reactive loading occurs in devices with electric motors, as well as in various electronic devices. In devices with rotating elements, they speak of an inductive load, and in electronics, a capacitive load.

On such devices, in addition to the consumed active power in watts, one more parameter is usually indicated - the coefficient cos (φ). With it, you can easily calculate the total power consumption.

To do this, the active power must be divided by cos(φ). For example, an electric drill with an active power of 700 W and a cos(φ) of 0.75 has a total power consumption of 933 VA. On some devices, the coefficient cos (φ) is not indicated. For an approximate calculation, it can be taken equal to 0.7.

When choosing a stabilizer, it is important to take into account the fact that for some devices the starting current is several times higher than the rated current. An example of such devices can be devices with asynchronous motors - refrigerators and pumps. For their normal functioning, a stabilizer is needed, whose power is 2-3 times higher than the consumed

For their normal functioning, a stabilizer is needed, whose power is 2-3 times higher than consumed.

Table 1. Approximate power of electrical appliances and their power factor cos (φ)

Household electrical appliances	Power, W	cos(φ)
electric stove	1200 — 6000	1
Heater	500 — 2000	1
A vacuum cleaner	500 — 2000	0.9
Iron	1000 — 2000	1
hair dryer	600 — 2000	1
Television	100 — 400	1
Fridge	150 — 600	0.95
Microwave	700 — 2000	1
Electric kettle	1500 — 2000	1
Incandescent lamps	60 — 250	1
Fluorescent lamps	20 — 400	0.95
Boiler	1500 — 2000	1
A computer	350 — 700	0.95
Coffee maker	650 — 1500	1
Washing machine	1500 — 2500	0.9
power tool	Power, W	cos(φ)
Electric drill	400 — 1000	0.85
Bulgarian	600 — 3000	0.8
Perforator	500 — 1200	0.85
Compressor	700 — 2500	0.7
Electric motors	250 — 3000	0.7 — 0.8
Vacuum pump	1000 — 2500	0.85
Electric welding (arc)	1800 — 2500	0.3 — 0.6

In addition, the manufacturers themselves strongly recommend using stabilizers with a 20-30% power reserve.

Stabilization accuracy for optimum instrument protection

When choosing a stabilizer, you should also take into account the maximum allowable voltage drop range for the devices to be protected.

If we are talking about the protection of lighting devices, then for them it is necessary to choose a stabilizer with a voltage stabilization accuracy of at least 3%. It is this accuracy that will ensure the absence of the effect of lighting flicker, even with fairly sharp power surges in the network.

Most household electrical appliances are able to work normally with voltage fluctuations in the range of 5-7%.

What to do - put one stabilizer on all consumers, or on each separately?

Of course, ideally, for each device that needs to be protected from power surges, a separate stabilizer of the appropriate power and stabilization accuracy should be installed.

However, from the point of view of material costs, such an approach cannot be justified. Therefore, most often the stabilizer is installed on the entire set of consumers, and its power is calculated based on the total power consumption. However, another approach is also possible.

For example, any one device can be protected by a stabilizer. In addition, a group of electrical appliances can be distinguished, the protection of which from voltage surges is an urgent need, and a stabilizer is installed to power them, while the rest, which are not so important and sensitive to surges, are left without protection.

The best stabilizers for installation on the input

A characteristic feature of such models is high power. To calculate the required indicator for such a device, you will need to take the nominal value of the introductory machine as a basis and multiply this value by 220 V.

Lider Ps30SQ-I-15 - industrial grade stabilizer

5.0

★★★★★
editorial score

100%
buyers recommend this product

A powerful three-phase electromechanical stabilizer is designed to protect sensitive household, industrial, medical and instrumentation equipment against voltage surges.

The main feature of this device is the highest stabilization accuracy, which is provided by a servo drive and a microprocessor control unit.

Advantages:

• High power;
• Wide operating voltage range;
• Maximum stabilization accuracy;
• Reliability and durability.

Flaws:

• Big mass.
• The price is almost 140 thousand rubles.

This stabilizer is suitable for installation at the input of a large cottage, workshop, production site or medical facility.

Progress 1200 T-20 - precise stabilization

4.9

★★★★★
editorial score

96%
buyers recommend this product

Powerful electronic (thyristor) floor-mounted stabilizer has a good operating range and high voltage stabilization accuracy.

All processes in it are controlled by a microprocessor. The device itself is distinguished by reliability and durability, but it also costs a lot - from 33 thousand.

Advantages:

• Excellent build quality and components;
• Good protection implementation;
• High stabilization accuracy;
• Forced cooling;
• Stable work under load;
• Digital indication;
• Bypass connection is allowed.

Flaws:

Large weight (26 kg).

Perfect for protecting all household appliances in the apartment.

Energy Classic 20000 - the widest operating range

4.9

★★★★★
editorial score

95%
buyers recommend this product

The wall-mounted hybrid high power stabilizer is designed to work in power networks with unstable voltage.

In terms of its reliability and technical characteristics, this domestic product is superior to more expensive imported analogues. Such a device costs a little more than 65 thousand.

Advantages:

• High power;
• Impressive working range;
• Good accuracy of output parameters;
• 12 stages of stabilization;
• Quality build.

Flaws:

Even heavier than the previous one - 42 kg.

Energy Classic 20000 is suitable for installation at the input of a small private house or workshop.

Volter SNPTO 22-Sh - a powerful stabilizer with decent performance

4.7

★★★★★
editorial score

89%
buyers recommend this product

Volter is a powerful model with a high response speed from a well-known Ukrainian manufacturer. A feature of this stabilizer is the use of a hybrid stabilization scheme.

The primary is a 7-speed relay system, the secondary is traditionally electronic. The device is equipped with overvoltage and short circuit protection, bypass, as well as a digital voltmeter.

Advantages:

• High power;
• Universal placement;
• Wide working range.
• Stable operation at low temperatures down to -40 °С.

Flaws:

• Not the highest stabilization accuracy;
• The cost is over 90 thousand rubles.

A very good model for installation on the input of a private house, but you will have to pay a rather large amount for it.

Resanta ASN 12000 / 1-C - option for giving

4.7

★★★★★
editorial score

82%
buyers recommend this product

Inexpensive and powerful relay autotransformer from a domestic manufacturer, capable of operating in a wide input voltage range.

Microprocessor control ensures high stabilization accuracy, fast response and high efficiency. The average cost is a little over 10 thousand.

Advantages:

• Easy to operate;
• Wide operating range;
• stabilization accuracy;
• Bypass.

Flaws:

Overvoltage protection leaves much to be desired.

An excellent model for protecting electrical equipment in a summer house or a small private house.

The best voltage stabilizers up to 1 kW

The characteristic features of low power autotransformers are: the ability to connect up to 4 consumers and a relatively low cost.

Stihl IS 1000 – with the highest response speed

5.0

★★★★★
editorial score

100%
buyers recommend this product

Double conversion wall-mounted instrument with the highest response speed and excellent voltage regulation. A feature of this model is a wide range of input voltages.

The reliability of the stabilizer is provided by an intelligent protection system against the main problems: overloads, exceeding the peak voltage, high-frequency interference.

Advantages:

• High response speed;
• Wide input voltage range;
• Active cooling;
• Guaranteed output voltage;
• Compact dimensions.

Flaws:

• Short power cord;
• A rather big price - 11 thousand rubles.

Stihl IS 1000 is the ideal solution for protecting expensive and capricious household appliances.

Rucelf Boiler 600 - the best model for protecting a heating boiler

4.9

★★★★★
editorial score

96%
buyers recommend this product

See review

Boiler 600 is a compact relay stabilizer with microcontroller control from a domestic manufacturer.

In addition to high-quality voltage stabilization within the declared parameters, the filling of the device provides reliable protection against surges, short circuits, overheating and lightning.

Advantages:

• Low cost - 2700 rubles;
• Quality assembly;
• Compact dimensions;
• Good resistance to frequent voltage drops;
• Double current reserve;
• Low standby power consumption (2W).

Flaws:

• A little noise when switching the relay box.
• Short power cord.

Excellent and inexpensive model for protection of gas coppers.

ERA SNPT 1000Ts - affordable household stabilizer

4.8

★★★★★
editorial score

90%
buyers recommend this product

Inexpensive relay device capable of operating in a wide range of input voltages. The model has a sufficient number of steps to ensure minimal voltage fluctuations at the output.

At the same time, the accuracy of its maintenance is at the level of the most modern analogues. Protection is standard for devices of this class: from overvoltage, overheating, RF interference.

Advantages:

• The price is only 2000 rubles;
• Light weight;
• Wide input voltage range;
• High precision output voltage;
• Sinusoid without distortion.

Flaws:

Design flaw of the turn-on delay button.

A good model for protecting a gaming PC or any other not too powerful device that is sensitive to voltage drops.

Powercom TCA 2000 - a reliable device for multimedia technology

4.9

★★★★★
editorial score

89%
buyers recommend this product

See review

Compact, reliable and lightweight relay stabilizer with protection against short circuit, current and voltage overloads, surge voltage.

Floor version. The device is designed to connect up to four devices with a total power of up to 1 kW.

Advantages:

• Wide range of input operating voltages;
• Good build quality;
• Stability of work;
• Compact dimensions;
• Low cost - up to 1800 rubles.

Flaws:

Loud relay switching sound.

A good model for protecting computer equipment, as well as audio and video systems installed by the group.

SVEN VR-L 1000 is an ultra-budget stabilizer for two devices

4.8

★★★★★
editorial score

86%
buyers recommend this product

One of the most compact and lightest relay voltage stabilizers, which is well-deservedly popular among our compatriots - mainly due to its low cost and wide input voltage range.

Despite the budgetary cost, the device has a well-implemented protection system: against overvoltage, RF interference, short circuit, overheating.

Advantages:

• Wide range of input operating voltages;
• Quality assembly;
• Compact dimensions;
• Good set of protections;
• The price is just over a thousand.

Flaws:

• Low power;
• Detachable network cable.

An excellent model for protecting the router and receiver - nothing else can be connected to this stabilizer anyway.

Detailed Infographic

Overview of 19 stabilizers

3 best in terms of price / quality - 10 kW

3 best home for 12 kW

Home rating - 15 kW

Reliability Rating: Top 3

3 best in terms of price / quality - 10 kW

3 best for a 3 kW home

4 best for a 5 kW home

Overview of 19 stabilizers

The stabilizer is not a cheap device. Therefore, before buying, I want to choose a model that will last not a year or five. Below are the most reliable devices available on the market.

Energy Hybrid SNVT-10000/1

4.0

A hybrid device that can handle voltage regulation in an apartment. No special power supply is required, only a standard single-phase 220 V is needed.

• The model provides protection against overheating, short circuit, interference and high voltage.
• The cooling system is quiet.
• Stabilization occurs at a speed of 20 V per second.
• Acceptable at the input 105-280 V.
• It has a high efficiency (98%).
• Stabilization accuracy 3%.
• The model is placed on the floor, the dimensions are relatively small - 24.6x32.8x42.4 cm.
• The cost of the device varies from 17,500 to 22,000 rubles.

Possible problems

In some areas of the city, additional protection against phase and pulse imbalance may be required.

Top 5 user comments

1. Blinking of incandescent bulbs during sudden jumps. Nothing was noticed on other types of lamps.
2. In silence, the noise of the device is heard.
3. Price.
4. The design is not well thought out.
5. Chinese details.

Top 5 pluses

1. Ease of installation.
2. Ease of operation.
3. Quality of work.
4. Durability.
5. Build quality.

Resanta LUX ASN-5000N/1-Ts

4.5

The relay stabilizer has shown itself well in practice. Quiet and easy to install, the wall-mounted stabilizer has earned a lot of rave reviews. The input needs single-phase 220V.

• Works with input 140 - 260 V.
• Outputs 202-238V, response time 20ms.
• There is a multilateral protection. Efficiency - 97%.
• Small (26x31x15.5 cm) and light (about 11 kg).
• The cost of the device is almost everywhere the same - about 6,000 rubles.

Top 5 user comments

1. No protection against dust is provided.
2. No moisture protection.
3. Intermittent relay clicks.
4. Flashing incandescent lamps.
5. Low power - 5 kW.

Top 5 pluses

1. Price-quality ratio.
2. Compactness.
3. Quietly works.
4. Easy to install.
5. Design.

Stihl R 500i

4.5

The double conversion stabilizer is not designed for a large load. The power of the device is 500 watts. Vertically on the wall, has a wide input voltage range - from 90 to 310 V. Suitable for connecting expensive or sensitive devices.

• Connection to a single-phase network, accuracy 2%.
• At the output 216-224 V.
• Protection against overheating, short circuit, interference and high voltage is installed.
• Efficiency - 96%.
• A compact (14.2x23.7x7.1 cm) and lightweight (2 kg) device costs around 6000-6500 rubles.

Top 5 user comments

1. The body is heating up.
2. Sounds when turning off, going into protection.
3. Medium-frequency rumble, audible up to a meter.
4. Design.
5. No digital indicator.

Top 5 pluses

1. Has two outlets.
2. Wall mount.
3. Quality build.
4. Compactness.
5. Price.

Energy ACH 15000

4.5

The relay floor stabilizer is designed for incoming 120-280 V.

• Accuracy 6%.
• Efficiency 98%.
• At the output 207-233 V.
• Protection against short circuit, interference, high voltage and overheating is installed.

Top 5 user comments

1. Short input cable.
2. Small display.

Top 5 pluses

1. There is a bypass*.
2. Design.
3. Quality parts and assembly.
4. The quality of the image on the screen.
5. Reliability.

RESANTA ACH-15000/1-Ts

4.5

Relay floor device with forced cooling.

• Input 140-260 V, output - 202-238 V.
• Standard protection, sine wave without distortion.
• The model is bulky and heavy, but copes with its task.

RESANTA ACH-15000/3-Ts

4.0

relay type device.

• Works in amplitude 140-260 V.
• The output is 202-238.
• Default protection installed. Placed on the floor.

Inverter Voltage Stabilizers

In recent years, a slightly different type of stabilizers has become more and more popular, different from triac or servo. They are called inverters.

It is considered more effective than all of the above.If for the rest the output voltage error can reach 5-10% and this is considered a normal value, then for the inverter it does not exceed 2%! Another plus is a wider input voltage range for equalization.

The stabilizer converts the unstable alternating current by passing it through the filter into a direct current, after which, passing through the inverter, it again returns it to a variable value with an ideal sinusoid.

This device no longer has a bulky toroidal transformer inside. As a result, it is much smaller and lighter.

Advantages of the inverter:

• wide input voltage adjustment range 90V - 310V
• small output error
• small dimensions and weight
• filters out high frequency noise
• instantaneous response to input voltage change
• works at negative temperatures from -40
• the declared service life at observance of the connected power up to 20 years

• high price
• not suitable for heavy loads
• Powerful models have cooling fans. Noise about the same as in the computer. Complete noiselessness is provided only by low-power instances.

When the load increases above 50% of the nominal, the inverter begins to decrease its input voltage parameters. That is, it will no longer be able to equalize the voltage of 110V, but will only work normally from 160V and above. The main reason for the failure of such devices is overload.

In order to protect themselves from overload, more expensive and high-quality inverter stabilizers, when the power is exceeded in automatic mode, can switch to bypass, that is, they will not give out a converted voltage, but the same as at the input.

But the inverter stabilizer does not have such a disease as the step stabilizers - the flashing of the lights when switching the control stages.

A good video clearly showing the difference between the operation of a relay and inverter stabilizer during sudden power surges: