Surge filter - how to choose for different types of equipment

Expert: Evgeny Mikhailovich Obolensky

*Review of the best according to the editors of expertology.ru. About the selection criteria. This material is subjective in nature, does not constitute advertising and does not serve as a purchase guide. Before purchasing, consultation with a specialist is required.

The modern Russian citizen has a large number of different home appliances. Therefore, it is not surprising that in a large family a free electrical outlet becomes scarce in the evening. In addition, residents in remote settlements often suffer from power surges. Sensitive devices fail, unsettling their owner. Simple but effective surge protectors help you take control of the situation. Some consumers call the device an extension cord with a button. But when choosing a splitter block, it is important to consider the length of the wire and the number of sockets. A few useful tips from experts will help you find the most suitable surge protector on the market.

How to choose a surge protector

1. Wire length
   . There are extension cords on sale with a power cord length of 1 to 50 m. You should not chase a long length; in a cramped apartment, a device with a cord of 1.5-2.0 m will be enough to connect a computer, printer and telephone. But when the electrical outlet is located away from the equipment, then the choice is made in favor of extended versions (10-50 m).
2. 220 V sockets
   . Before going to the store, you need to calculate how many electricity consumers will be simultaneously connected to the surge protector. To the amount received you should add 1-2 spare sockets. If you are using a pad for charging smartphones or a power bank, it is better to take a closer look at models with USB ports.
3. USB ports
   . The presence of USB connectors allows you to make the surge protector more compact. The ports differ in their rated current. Most often, 1.0-2.0 A is allocated to one connector, but it is worth paying attention to the maximum total current level. Sometimes when connecting several gadgets, the power on each connector drops sharply.
4. Protection systems
   . A surge protector is not only an extension cord and a splitter, but also a reliable assistant in the fight against voltage surges. Many models are capable of protecting devices from short circuit (short circuit), overheating, exceeding the maximum load, and high-frequency interference. A very useful option if there are small children in the house would be to protect sockets with special curtains. If you plan to take the surge protector outside, then it is better to give preference to products with a waterproof design.
5. Power
   . Each surge protector has a limit on the total power consumed by connected devices. It ranges from 2.0-3.0 kW. Exceeding the threshold specified in the passport will, at best, trigger the automatic fuse. Therefore, experts recommend caution when connecting powerful electrical appliances, such as heaters, irons, kettles or washing machines, to the block.
6. Equipment
   . Surge protectors have different equipment, ranging from regular sockets to the control option via Wi-Fi. The simplest devices, consisting of a wire, sockets and a switch, are suitable for those users who are looking for an extension cord. Modern users require not only power outlets, but also USB ports, battery slots, and reliable protection for all connected devices. And the most advanced users choose network filters that can be controlled via the Internet.

Our review includes the 15 best surge protectors. All of them have been tested in our country and received positive ratings from experts and users.

Filter device

The design contains 2 mandatory working elements - a varistor to normalize voltage and an LC filter to smooth out interference. The device also contains other elements that extend the service life of the device and increase efficiency.

Interference filter

The design (LC) consists of a neutral and phase wire, which are connected to an inductor. There are one or more capacitors between the wires. Typical ratings of coils are 50-200 microhenry, capacitors are 0.22-1 microfarad. Necessary for smoothing out impulse noise, which negatively affects the operation of devices. The LC filter "absorbs" this noise, making the signal smoother and more even.

Tumblr

Used to avoid unnecessarily pulling the plug out of the socket. The toggle switch reduces wear on the contact plates of sockets, increasing their service life. This is an optional part.

Varistor

A semiconductor component with a nonlinear current-voltage characteristic is a varistor. When a certain voltage value is reached, it protects the load by briefly closing the circuits.

Helps protect equipment from “bad” voltage. A varistor with a rating of 470 Volts is used as standard.

Rosette group

A socket group is a set of sockets for connecting devices to them. There are filters for 1, 2, 3 or more home appliances.

What is better: stabilizer or surge protector?

What is the difference between a surge protector and an extension cord?

An extension cord for a computer is a simple wire, at one end of which there are several sockets, and at the other end there is a plug. The cheapest ones do not have power buttons.

If the house has old wiring and modern circuit breakers are not installed, it is better to buy a surge protector. It has a number of differences from simple extension cords.

1. There must be buttons to turn it on and off.
2. The presence of a circuit breaker that trips during power surges.
3. Ensuring protection of equipment from radio frequency and electromagnetic interference.

It is recommended to use a specialized splitter to connect desktop computers, peripherals, and laptops.

Rating of the best network filters

Features of choice

The choice of device model depends, first of all, on the buyer, as well as where it will be used, for what purposes and devices.

Home electrical systems don't have huge power surges or high-tech interference. Therefore, it is enough to take medium-type equipment: not too expensive, but not the smallest and cheapest.

Before you buy a surge protector, you need to calculate:

• the number of required sockets and the required power, based on the number of connected devices;
• cable length;
• wishes for filtering additional ports (phone, network).

Photo: additional ports to protect local and telephone networks

When choosing a voltage stabilizer for an office or several powerful equipment (for example, a widescreen TV and a gaming computer), you need to take into account production requirements, such as:

• amount of equipment;
• probability of interference and its power;
• amplitude of voltage surges.

It is not recommended to save on a voltage compensator for the office. Read the review and choose the most suitable model, since one failure can cause a production stop due to the failure of the entire system or lack of access to the server machine.

The best classic surge protectors

Traditional surge protectors are a simple device consisting of a wire, outlets and a switch. Some models have a power button for each socket, which is convenient when using devices with different operating hours. Experts have selected several reliable devices.

APC by Schneider Electric P43B-RS, 4 sockets 1 m/w

Rating: 4.9

The surge protector from a well-known brand is equipped with four sockets and a meter of wire. At the entrance there is a general switch with LED backlight. The black case is less easily soiled and retains its attractive appearance longer. Grounding will protect the user from electric shock due to a short circuit. There are holes at the bottom of the case for wall mounting. The maximum energy absorption by the filter is possible up to 918 J, which is one of the highest values. In the reviews, buyers are satisfied with the high-quality assembly, durable plastic and rigid fixation of the plug in the surge protector. Owners also note the absence of an unpleasant odor, which usually occurs with similar products from a lower price category.

The classic type surge protector is notable for the presence of durable built-in curtains. They cover openings with current-carrying parts, increasing safety. When the plug is turned on, the user overcomes the resistance with force, and the connector can be inserted with one hand.

Advantages

• light indication on the body;
• compact dimensions 56x40x276 mm;
• not easily soiled color;
• grounding is provided;
• built-in curtains.

Flaws

• The plug is difficult to remove.

Criterias of choice

Filtering elements

Devices with the largest number of filtration elements provide maximum protection. The simplest models are equipped with varistors. More expensive ones have capacitors, a choke, coils, and LC filters.

Number of sockets

Today, the market offers filters with a number of sockets up to 10. When choosing, the number of simultaneously connected electrical appliances is taken into account. The total power is calculated. It should be less than a third of the network filter indicator.

Cord sizes

The indicators are indicated in the product passport. Dimensions do not affect performance, but increase cost. The length should be selected depending on the location of electrical appliances.

The magnitude of the compensating impulse

This is one of the main indicators of a surge protector. It is indicated in the documentation supplied with the device. The higher the value, the more reliable the protection. Helps with frequent power surges.

Manufacturer

The variety of companies and models makes it difficult for an inexperienced user to choose. It is worth paying attention to devices from such brands as SVEN, Pilot, APC by Schneider Electric, Defender, XIAOMI, ERA, MOST, ORICO.

Purpose of the equipment

For computers, a filter with capacitors and varistors is selected. They protect equipment from high-frequency and impulse interference. For household appliances, standard surge protectors that match the total power are suitable. For regular TVs, you can purchase devices with a power of 250V, for LCD models - with maximum protection.

The best surge protectors with USB ports

More and more domestic consumers prefer to buy surge protectors with USB ports. They allow you to connect smartphones, laptops and other gadgets without the plug looking bulky. Experts liked the following models.

Oehlbach Power Socket 905 1.5 m

Rating: 4.9

The Oehlbach Power Socket 905 surge protector is an example of reliability and safety. The product is manufactured in accordance with the most stringent requirements of international standards. The German manufacturer offers a power supply with 8 grounded sockets. They are turned on by one round shaped switch. To connect smartphones or tablets, there are two USB ports. They are also controlled by a common switch. The reliability of the contacts is ensured by gold plating (24 carats), which affects the cost of the filter.

Experts conducted a series of tests and were convinced of effective protection against various negative manifestations in the electrical network. In the event of a power surge, the filter disconnects all consumers from the network, and is turned on by pressing the Reset button.

Advantages

• German quality;
• reliable protection against overloads and surges;
• 8 sockets and 2 USB ports;
• gold plated contacts.

Flaws

• high price.

APC PM6U-RS

Rating: 4.8

To get into the top three ratings, the APC PM6U-RS surge protector required several factors. First of all, experts approved the thoughtful protection of all consumers from various types of interference. The device allows you to connect 6 devices. Three sockets are located on the top panel, and the same number are installed on the side. Additionally, there are 2 USB ports for charging gadgets. The model is designed for a maximum load of up to 2.3 kW and a current of up to 10 A. Thanks to the high maximum pulse interference current (24,000 A), the device can be used as a voltage stabilizer.

Users are satisfied with the quality of workmanship, thoughtful design and reliability. The disadvantages include the lack of separate switches and the high price.

Advantages

• convenient design;
• performance indicators;
• excellent current stabilization;
• 60 months warranty.

Flaws

• high price;
• inaccurate operation of indicators.

LDNIO SE6403, 6 sockets, 2 m, s/z 2500 W

Rating: 4.7

Another popular network filter is LDNIO SE6403, designed for a total load of up to 2.5 kW. This allows you to connect not only tabletop appliances to it, but also an iron or heater. Six sockets in the network device are arranged in pairs, so the design is compact and convenient. The USB ports are placed on the edge so that they can be easily accessed when all the sockets are occupied by plugs. Two meters of cable extends the filter location from the base outlet. The bright indication on the switch is clearly visible even during the day. It is easy to understand from it whether power is being supplied or the splitter is de-energized. In reviews, the surge protector is noted for the presence of disc shutter plugs that prevent a child from accidentally plugging a foreign object into the socket. The owners are also pleased that each port produces 3.4 A, which allows them to charge the phone faster.

The network model stands out for its functionality. It has 6 standard outlets that allow you to power your computer, printer, desk lamp, heater or air conditioner. In addition, there are 4 USB ports for recharging phones, tablets, razors and other gadgets with batteries.

Advantages

• long wire 2 m;
• four USB ports;
• designed for power 2500 W;
• bright light indication;
• built-in curtains in each outlet.

Flaws

• thin wires inside;
• glides on a smooth surface;
• there is no relay inside.

Xiaomi Mi Power Strip 3 sockets / 3 USB

Rating: 4.7

High quality workmanship and an affordable price were the key factors for including the Xiaomi Mi Power Strip 3 sockets / 3 USB surge protector in our rating. The manufacturer took care of the durability of the device; when creating the model, the solid casting technique and a special type of bronze were used. The extension cord is designed for a maximum power of 2.5 kW and a current of up to 10 A. Overload protection is provided by a reusable fuse. The filter has 3 universal sockets and 3 USB ports. The maximum total current in USB connectors is 3.1 A.

Domestic users liked the design of the Chinese device, its functionality, power and reliable fire protection. Only a short cord (1.8 m) and a bright glow of the general power button irritate owners.

Advantages

• fast charging of gadgets;
• versatility;
• functionality;
• quality production.

Flaws

• short cord;
• no grounding.

Defender DFS 501 2 m

Rating: 4.6

The Defender DFS 501 surge protector is designed in the form of a traditional block, in which all sockets are located on the same row. Of these, 6 sockets with grounding and 2 USB ports. Each port is powered by a current of 1 A. The device is turned on by a common switch with light indication. The model is designed for a maximum power level of 2.2 kW at a current of 10 A. A protection status indicator is installed next to the switch. The filter protects household electrical appliances from short circuits and overloads, as well as from high-frequency interference. The manufacturer has equipped its product with a 2-meter cable.

Many users are satisfied with the combination of affordable price, appearance and number of outlets. But some shortcomings did not allow the model to take a higher place in the ranking. These are tight curtains and soft plastic housing.

Advantages

• many sockets;
• decent design;
• affordable price;
• recessed power button.

Flaws

• tight curtains;
• soft plastic.

How to connect a regular and built-in filter

A surge protector is often confused with a classic extension cord. The only common characteristics they have is their appearance. Their operating principle is different. The main task is to absorb voltage surges.

The connection is similar to turning on the adapter. Plug it into the socket, then connect the necessary household appliances to it. After the household appliances are connected, turn on the button on the housing. When used for more than seven days, it should be unplugged from the outlet during breaks.

Each model has its own maximum power rating for which it is designed. Therefore, it is important to ensure that the total load of connected devices does not exceed this value, otherwise the device will fail.

When working, you must follow the safety rules:

• You cannot connect several filters to each other;
• if a computer is connected to the filter, then you cannot connect fans, air conditioners and other powerful equipment to it;
• For equipment with high power, you should buy a separate filter.

The best surge protectors with interesting features

Network filters can have the most unexpected capabilities. Some devices allow you to charge not only mobile phones, but also AA batteries. Other models have a certain intelligence and can be controlled remotely. The following inventions have different advantages.

CROWN MICRO CMPS-10, 10 sockets, 1.8 m, s/z 3680 W

Rating: 4.9

The multifunctional surge protector is notable for the presence of 10 sockets where you can connect a lot of household appliances or office devices. In addition, it has two USB ports, so you can charge your smartphone or tablet separately. All openings in sockets are covered with protective curtains. The presence of numerous sockets is not a marketing ploy, since the permitted load is 3680 W. The network device has a ground connection and holes for wall mounting. According to reviews, customers like the presence of informational stickers indicating USB current. Also here, the sockets are not symmetrically located, which allows you to use all sockets even with L-shaped plugs (their “tails” will not rest against each other).

Other interesting features of the network device include an RJ-11 port, which provides telephone line protection. The filter also has a BMC port for coaxial cable, protecting the television antenna.

Advantages

• there are grooves for fixing to the wall;
• network cable 1.8 m;
• 10 classic sockets;
• Load up to 3680 W is allowed.

Flaws

• quite large dimensions 165x80x420 mm;
• weighs more than a kilogram;
• high price.

Xiaomi Mi Power Strip Quick Charger 2.0

Rating: 4.8

The smartest in our rating was the Xiaomi Mi Power Strip Quick Charger 2.0 surge protector. The user can control its operation remotely from home thanks to the built-in Wi-Fi module. There are 3 sockets without grounding and 3 sockets for an international plug in two rows on the case. The device can operate according to a configured schedule, keep track of energy consumption, and turn on and off using a timer. The sockets are equipped with protective curtains, which is especially important for families with small children. The filter is able to protect household electrical appliances from short circuits, voltage surges, overloads, thunderstorms and overheating. At the same time, the cost of a smart device is quite affordable.

Experts note the electronic power button and the presence of two indicators. The model becomes the winner of our rating.

Advantages

• control via the Internet;
• timer;
• work according to schedule;
• reasonable price.

Flaws

• short cord (1.8 m).

APC PMF83VT-RS 3 m

Rating: 4.7

An excellent universal surge protector for the home can be the APC PMF83VT-RS model. This device has 8 sockets, which have a compact arrangement (4x2 circuit at an angle of 90 degrees). The manufacturer has implemented several protective bundles that can protect not only your computer, but also your TV and phone. There are two sockets each for connecting a home phone and a TV (input and output). Experts highly appreciated the excellent parameters of energy absorption and smoothing of peak loads. Three light indicators located next to the general switch will allow you to monitor the operation of all protection systems.

Users in reviews speak flatteringly about the versatility of the device, long cable (3 m), and light indication. The disadvantages include the high price.

Advantages

• high-quality assembly;
• protection of various home appliances;
• informative indicators;
• compactness.

Flaws

• high price.

Universal U10-026 IP-44 PVS 3×1.5 10 m

Rating: 4.5

Extension cord Universal U10-026 IP-44 PVS 3×1.5 is designed for connecting various equipment in open areas. The model is made in a moisture-resistant design, all sockets are covered with protective covers. The surge protector stands out among competitors with its high maximum power (3.5 kW), rated current (16 A) and wire length (10 m). The block has 5 grounded sockets, which are turned on by one common button with light indication. The power and reliability of the product is provided by a three-core copper wire with a cross-section of each wire of 1.5 square meters. mm.

The extension cord takes fourth place in the rating for its quality factor and affordable price. The disadvantages of the domestic product include modest protection against electrical faults.

Advantages

• long wire;
• protection from moisture and dust;
• quality materials;
• acceptable price.

Flaws

• few levels of protection.

APC by Schneider Electric PM8-RS

Rating: 4.5

The original design was developed by American engineers. The APC by Schneider Electric PM8-RS surge protector has 8 sockets, they are divided into 2 groups of 4 pcs. These groups are located at an angle of 90 degrees, which made the device more compact. There is free space between the sockets, making it quite convenient to connect devices. There are three indicators next to the general switch. One of them signals surge protection, another controls grounding, and the third turns on when overloaded.

The model takes a worthy place in the ranking due to positive consumer reviews. They note the ease of use and the presence of useful indicators. There are no comments about the build quality.

Advantages

• high-quality assembly;
• universal connection;
• ease of connecting devices;
• 5 year warranty.

Flaws

• unreliable mount for wall mounting.

The best and most reliable filters for your computer

Computers and laptops need protection from power surges and interference. For stable operation, it is important to choose the right filter. There are devices with and without grounding. You should also purchase an uninterruptible power supply for your computer, which will allow you to save data on your PC during a sudden power outage.

With grounding: operating principle

Grounding is the main condition for the safety of the device. In case of overheating or short circuit, the device dumps excess voltage or current to grounding, which protects the device from breakdown or fire.

Without grounding: what does it protect against?

Suppresses short-term impulse noise thanks to the semiconductor element. To suppress network noise, the design contains inductors. There is a special fuse to protect against short circuits.

Built-in wall

In-wall appliances are used in homes with a three-wire network. Popular models of this type of device are Mosaic 45 from Legrand.

How does automatic shutdown work?

Models with automatic shutdown react to excess current/voltage in the network. They turn off the power supply to devices, protecting against fire and damage. Automatic units do not require constant replacement and have a longer service life. To restore operation after a power surge, just press the button on the filter. Such devices are more expensive than classic ones.

The best smart surge protectors

Smart surge protectors can be integrated into smart electronic home control systems to make your life easier. They will help you start your air conditioner, humidifier, boiler and other equipment at the right time. Here are the best options available for purchase in the Russian Federation.

Rubetek RE-3310 with Wi-Fi, 3 sockets, 1.8 m, 10A / 2500 W

Rating: 4.9

The category is headed by a network smart filter with Wi-Fi, which supports control of connected devices according to a given scenario. The list of actions can be set for the entire filter or for each socket separately. Thanks to a wireless network, you can turn on sockets remotely, starting the necessary devices at will. The total load on the filter is permissible up to 2.5 kW, so it can even withstand an iron. Three classic sockets and 4 USB are convenient for connecting different gadgets. The PVS wire is very flexible and its length of 1.8 m is often enough to access different consumers without an additional extension cord.

The main feature of the smart network filter is voice control. You can set commands to turn on appliances in the house and it will sequentially start the selected equipment. The network device works with the Rubetek and Yandex Smart Home systems. From the reviews it is clear that pairing is simple and each 220 V socket can be assigned a separate name.

Advantages

• built-in overload and short circuit protection;
• supports voice control;
• each 220 V outlet is assigned a separate name;
• There is a separate application for “manual” control.

Flaws

• USB are all turned on at the same time and cannot be adjusted individually.

HIPER IoT PS34, 3 sockets, s/w, 10A / 2500 W

Rating: 4.8

The global brand Hiper offers a smart network filter with 4 USB and 3 220 V sockets, which works via Wi-Fi via an application. In the settings, you can set a schedule or manually control the voltage supply to each outlet. All sockets have reliable protective shutters and are grounded. The device is designed for a total power of 2500 W, and if it is exceeded, an emergency shutdown will trigger, so there will be no fire. The white switch on the case allows you to mechanically de-energize the filter if necessary or in the event of a hacker breaking into the smart home system.

This is a universal network filter that is compatible with all common smart systems. It can be integrated into Google Home or Yandex Smart Home. If you are just assembling components (peripheral devices), but have not yet decided which system you will use, take this filter - it will fit any.

Advantages

• there is overload protection;
• blocks short circuit;
• universal for connecting to various smart control systems;
• intuitive application.

Flaws

• high price.

DIGMA DiPlug Strip 40, 4 sockets

Rating: 4.7

The category is completed by a smart network filter from Digma, which has four 220 V sockets and 4 for charging various devices via USB. The elongated case can be mounted on the wall using 4 holes in the back cover. Classic white color looks equally good both in the office and at home. The product has a 1 year warranty. The device connects to Wi-Fi and is controlled remotely via an application with intuitive settings.

We have identified this network model as the best in terms of price and quality ratio. It costs 500-1000 rubles cheaper than its competitors, but is in no way inferior in characteristics. Another advantage of the filter is its compatibility with the Mail.ru smart home.

Advantages

• Wi-Fi communication protocol;
• works even with not very common systems;
• 4 USB ports;
• more affordable price.

Flaws

• Doesn't work with Google Home.

What to look for when choosing a surge protector

Let's consider the main parameters of network filters that you should focus on:

1. Network wire length. The most common values ​​are 1.9 and 3.1; in more rare cases, a wire up to 5 meters long is used.
2. The size of the wire cross-section. The best option is 0.75 mm2 or 1 mm2, suitable for a load of 10 amperes, which is what most surge protectors are designed to support.
3. At what current value does the thermal fuse trip? Most manufacturers set the maximum permissible current value to 10A. Depending on the size of the overload and the response time, the fuse may trip at values ​​in the range of 12-16 amperes.
4. How much energy can varistors dissipate without breaking down? In particular, this parameter is affected by the dimensions of the element. The most commonly used varistors are with diameters from 8 to 18 mm.
5. How many fuses are there in the device? In addition to the thermal fuse, a fast-acting fuse based on metal-organic semiconductors can be installed, plus the manufacturer can install a fuse in the neutral circuit.
6. The presence of additional elements of the device, such as an LED indicator that stops working if the safety elements burn out, and a gas discharger. Surge protectors also include USB ports through which you can charge gadgets without using an adapter.
7. The capacity of capacitors that filter the electrical current of the network from interference.
8. The presence or absence of a hanger, usually represented by holes in the surge protector housing.
9. Number of sockets and their type. The number of sockets usually varies from 4 to 6, most often there are 5 places for plugs in the case. In accordance with modern standards, the network uses Euro sockets with grounding. You can purchase models with one universal socket without grounding, in which you can use any plug.

Basic parameters of network filters