How to choose current clamps: TOP 10 best current clamps

Purpose

The main purpose of the tool is to prevent electric shock in high voltage environments. For voltage values ​​not exceeding 1000 volts and not exceeding 35,000 volts, different types of devices will be used. Their scope of use is as follows:

• help install and remove fuses in various electrical installations.
• used for removing closed screens and dielectric gaskets.
• other work under voltage.

When working with insulating clamps over 1000V, in addition to insulation, individual worker protection must be used in the form of dielectric rubber gloves and a mask. In some cases, it is permissible to use a special insulating rod with a universal tip instead of insulating pliers.

Working with pliers

Purpose and types of current clamps

A clamp meter is perhaps the only tool that allows you to measure current in a circuit without breaking it. They differ in design, functionality, maximum measured voltage and type of measured current (DC or AC). So what could our ticks be and how do they work?

Let's start, perhaps, with the well-known one-handed pliers - essentially it is a multimeter (most often) with an additional current sensor. Using such clamps is quite simple - to do this, just switch the switch to ammeter mode, separate the clamps and bring them together, enclosing the conductor inside the ring. The current strength in this conductor will be displayed on the digital indicator.

To measure current in hard-to-reach places, some models have a button for fixing the result.

Such one-handed pliers are designed for relatively low (up to 1000 V) voltage and, due to their compactness and ease of use, are most suitable for use in domestic conditions.

Important! You can measure current only on a single conductor - if you cover both wires with clamps, you will get zero as a result. This happens due to the fact that a current flows in the conductors, equal in value, but different in direction. A result other than zero indicates the presence of a leak equal to the result obtained.

In addition to one-handed ones, two-handed ones are also produced, designed to work with voltages from 2000 to 10,000 V.

It is no longer possible to work with such pliers with one hand. Such an inconvenient design was invented for a reason. The fact is that, for safety reasons, current measuring devices intended for measurements above 1 kV must have an insulator length of at least 38 cm, and handles of at least 13 cm. Fortunately, such voltages are practically never encountered in everyday life, so work with two-handed Few people will need to use ticks.

As already mentioned, in addition to the maximum measured voltage, clamp meters also differ in the type of current measured. What are the differences between them and how do you know what type of current a particular device is designed for? This is actually not difficult - according to the markings on the body (now we mean pliers of high or at least medium quality, and not collected in the basement on your knees). Thus, on the housing of clamps intended for measuring alternating current, the marking will be AC, while for direct current - DC (more often - ACDC). The differences are in the operating principle. Current clamps for measuring alternating current operate on the principle of a single-turn transformer.

In general, the design of AC current clamps is simple. They consist of an adjustable magnetic circuit with a secondary winding wound on it, connected to an ammeter. The role of the primary winding is the conductor being measured, the current flowing through it creates an alternating magnetic field, transmitted through the magnetic circuit of the secondary winding and exciting electromagnetic induction in it. The resulting electric current is precisely measured by an ammeter. This diagram explains the working principle of AC current clamps, but how do DC current clamps work? After all, as you know, a transformer can only operate in alternating current circuits. Now we will get an answer to this question.

To measure direct current, different principles are used. It is well known that a conductor through which electric current flows creates a magnetic field around itself, and the higher the current strength, the more powerful this field is. So, by measuring this field, you can get an idea of ​​the strength and even direction of the current. The presence and intensity of the magnetic field is determined by a special sensor (Hall sensor). Clamps equipped with a Hall sensor, unlike transformer clamps, are capable of measuring both direct and alternating current, and are slightly more expensive. So if you have to choose which ones are better to buy, then these are the ones that are recommended. In addition to its direct functions (measuring current without breaking the circuit), many modern clamps are a full-fledged tester (multimeter) that allows you to measure voltage, resistance, as well as ring sections of the circuit and check the performance of some radio elements.

But we should also not forget about analog (arrow) clamps, which, despite all the advantages and conveniences of their digital counterparts, still continue to be used along with them. This happens due to their lower cost and ability to work without a power source.

Now, knowing what current clamps can be, you can go directly to the review. Today's rating will feature 10 pliers from different manufacturers, different price categories, but certainly having high user ratings. The pliers will be positioned in ascending order of their quality.

Video - What are current clamps used for and why are they better than a multimeter?

Device of insulating clamps

This tool includes:

• Frame.
• Sponges. This part of the device is made of metal or material with good electrical insulating properties. If the working part of the tool is made of metal, it must be protected with insulating material. This will prevent damage to the porcelain fuses during installation.
• There are two types of handles and insulating parts for the tool. If the pliers are designed to operate at voltages up to 1000 volts, polypropylene is used for insulation.

Important! The operating voltage of conventional clamps varies from 1 V to 10 kV. This device has a different design depending on the voltage value. If the voltage varies from 10 to 35 kV or higher, glass epoxy phenolic pipe is used to make the insulating element and handle.

Device structure

Rating of the best current clamps - TOP 10

Current clamps are classified as highly specialized tools. Their range of tasks is clearly limited: measuring the strength and voltage of currents, resistance, capacitance, temperature, frequencies. At the same time, finding a model that combines all possible options at the same time is problematic.

The rating of the best current clamps presents the TOP of the most successful models with a competent combination of functions and ranges. The testers presented below are suitable for most types of work, both at home and in construction or when installing electrical networks.

FLUKE 302+

A professional and inexpensive device from an American brand, it is equipped with a shockproof housing, a bright display backlight for working in low light conditions, and an auto-shutoff function to save battery life. Among the advantages, users note the wide opening of the “pincers” - up to 3 cm, high accuracy of readings and a memory function for the last 5 values. Pincers are often included in various collections due to their high and stable measurement accuracy.

Advantages:

• high measurement accuracy;
• small dimensions and weight;
• large backlit display;
• high degree of protection against voltage surges;
• low cost in its class.

Flaws:

• sensitivity to low temperatures;
• There is no storage case included.

Mastech MS2008B

Inexpensive, but at the same time functional current clamps Mastech MS2008B have all the necessary options. Automatic and manual measurement ranges, dial-in mode, auto-off, ambient temperature measurement, DATA HOLD function, which allows you to save the latest values ​​in memory. Additionally, the device is equipped with a convenient flashlight to illuminate the work area.

Advantages:

• affordable price;
• great functionality;
• built-in flashlight;
• light weight;
• durable body.

Flaws:

• inconvenient switching between modes;
• With frequent use, the buttons begin to stick.

CEM DT-3341

Owned by a Chinese company, the CEM brand is known in many countries around the world; the products of this company are certified according to various quality standards. The DT-3341 model, listed in the state registry, is designed to measure AC current, air temperature, DC/AC voltage, capacitance and resistance. Current clamps are equipped with high-quality screen backlighting, a convenient functional switch and a “dialing” function. The clamp size of the pliers is 3 cm, auto shut-off is triggered after 15 seconds. According to reviews, this is a good device for measuring direct and alternating voltage with a slight error.

Advantages:

• durable rubberized body;
• low cost;
• high measurement accuracy;
• presence of a cover included;
• 2 years official warranty;
• function switch.

Flaws:

• no memory function;
• Some batches of tools are supplied with inappropriate instructions.

UNI-T 13-0009 UT-210E

As users note, the UT-210E pocket compact device is an indispensable assistant in the household, as well as when repairing cars. The pliers are also suitable for professional use, including repairing air conditioners. The main advantages of the device are automatic selection of ranges, the ability to measure direct current min. 2A max. 100A, leakage to ground. The accuracy of these current clamps is comparable to professional models. The memory function, high-definition screen and small dimensions simplify the user's work, and the buttons are quite tight to avoid accidental pressing. Not included in the state register.

Advantages:

• ultra-small dimensions and weight;
• auto power off and memory function for last values;
• accuracy;
• sound sensor.

Flaws:

• small opening of pliers 170 mm;
• poor quality of the probes included in the kit.

CEM DT-360

One of the most budget-friendly measuring instruments, the DT-360, despite its modest functionality compared to more expensive clamps, belongs to the “pro” class. This is a good clamp meter at an affordable price, with which you can measure AC/DC voltage up to 600V, AC 400A, resistance. Useful functions include DATA HOLD, screen backlight, and battery charge indicator (crown). Entered into the state register.

Advantages:

• best price in its class;
• double impact-resistant housing;
• excellent combination of price and features;
• clear display of values ​​on the screen;
• coverage up to 3 cm;
• clear algorithm of operation.

Flaws:

• early backlight shutdown 10 sec;
• There is no way to measure direct current.

BISON Professional PRO-824 (59824)

Current clamps from ZUBR are equipped with a wide grip up to 3 cm, a rubberized, shockproof body, and a MAX HOLD function, which allows the device to remember not only general, but also maximum values. The large backlit display makes it possible to see measurement results even in poor lighting conditions. The wide functionality, combined with the accuracy of the readings, significantly expands the scope of application: these are the best current clamps that are suitable for both home and work. It is not listed in the state register.

Advantages:

• there is a “continuity” mode, diode test;
• Ease of Management;
• indication of device overload;
• suitable for both domestic and professional use;
• measurement of maximum alternating current up to 1000 A.

Flaws:

• frequent warranty cases;
• no DC current measurement.

IEK Expert 266F

Simplicity of execution has significantly reduced the cost of the Expert 266F current clamps, but the manufacturer has retained all the functions necessary for domestic use. The device is equipped with a wide clamp up to 5 cm, an LCD monitor with a digital scale, and it is possible to take readings in a non-contact manner.

Advantages:

• convenient button for opening the pliers;
• Includes a carrying case;
• safety and reliability;
• ease of operation.

Flaws:

• very sensitive to low temperatures;
• Measures alternating current only.

STAYER 59820

The current measuring device of the German brand STAYER is characterized by users as an unpretentious, durable instrument. Its body is designed in such a way that the operator can take measurements with one hand. It is possible to diagnose electrical devices and connections without interrupting the voltage supply. This is a high-quality current measuring device with a long service life, designed for active use. For convenience, the manufacturer has added a convenient bag - a cover.

Advantages:

• clamp size 30 mm;
• digital data display;
• acceptable measurement accuracy;
• clear interface;
• supports temperature measurement;
• possibility of measuring AC/DC current.

Flaws:

• small display;
• difficult mode switching.

EKF MS2016S

MS2016S current clamps belong to the household class, however, due to their high-quality performance and high accuracy, the clamps have received many good reviews. The device automatically scans current and voltage, as well as resistance. The DATA HOLD option can store received data in memory and display it on a wide, digital display at the right time.

Advantages:

• the best combination of “price and quality”;
• clarity of instructions;
• memory for storing data.

Flaws:

• limited functionality.

RESANTA DT 266C

According to user reviews, RESANTA current clamps confidently cope with their task, and in terms of accuracy of readings they are not inferior to more expensive analogues. In addition to the standard set of options, the mites are capable of measuring air temperature. They are also equipped with a “dialing” sound signal, overload protection, and a rotary mode switch.

Advantages:

• good functionality;
• accuracy of measurements taken;
• additional overload protection;
• convenient design.

Flaws:

• weak beep;
• poor operation of the switch wheel;
• frequent warranty cases.

Options

The main parameters of the clamps are the operating voltage and their size. These quantities are inextricably linked:

• At voltages up to 1 kV there are no size restrictions.
• At voltages from 1 to 10 kV, the insulating part must be at least 45 cm, the handles - from 15 cm.
• At voltages from 10,000 to 35,000 V, the size of the insulating part is from 75 cm, the handles are from 20.

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Clamps for different voltages

How to use insulating pliers correctly

Three types of clamps have been put into operation: up to 1, 10 and 35 kV. There are also some atypical products for fuses in relays and alarms - for convenience, the design of such tools is as simple as possible.

Each of these tools has its own characteristics and rules of use. When using any type during operation, the possibility of moisture entering the work area should be prevented. In wet weather, care must be taken when performing electrical work outdoors, especially in rain, snow or fog.

In addition, regular testing of the product is a prerequisite for operation. This is a special effect of a certain current strength for 5 minutes. This process is carried out twice a year. The voltage level will vary depending on the type of device. Only with timely and regular inspection can absolute protection against electric shock be guaranteed. The performance tests included only increasing the discharge power and no mechanical testing due to lack of necessity.

Important rules for carrying out work:

• When working with a circuit where the voltage exceeds 1000 V, you must additionally have rubber gloves.
• When working with particularly high voltage, small particles may be released that can damage your eyes or burn your face. To prevent this, special glasses or masks are used.

Additional protections

Selecting current clamps

To determine the measured current parameters in modern clamps, Hall sensors (semiconductor devices that determine the magnitude of the magnetic field) are used.
The cost of devices with a Hall sensor is significantly higher than that of current clamps made on the basis of an instrument transformer. The higher cost is offset by the ability to measure both AC and DC current, and they also have higher sensitivity, accuracy and stability of results.

The most significant difference between DC clamps and each other is the number of Hall sensors built into the magnetic circuit. In cheap versions of current clamps, one sensor is usually used for measurements, and in more advanced and professional versions, two sensors are used.

Pincers differ in the size of the magnetic cores and the size of their opening, up to designs with a constantly open mouth, which, while reducing the sensitivity and accuracy of the device, significantly increases the ease of use in confined spaces.

In addition to the number of Hall sensors, the devices are distinguished by a multimeter built into the clamps; it is the multimeter that determines the set of functionality of the clamps, the stability and accuracy of measurements, as well as the processing speed of the measured parameters, the width of the measurement range (number of readings and ranges) and the convenience of measurements.

Basic functions

DC current clamp meters are:

• Current and Voltage Measurement
• Testing wires with a sound signal.
• Determination of current frequency.
• Setting the zero for interference from neighboring wires, as well as for compensating magnetic fields.

Options to make your work easier:

• Fixing measurement results – “Hold” button
• Measuring the inrush current (sometimes several times higher than the rated current)
• TRUE RMS function, which allows you to determine the root mean square value for alternating current of an arbitrary waveform.
• Automatic range selection when displaying results.
• Possibility of connecting a sensor to measure temperature.
• Convenient, large display with bright backlight.
• Additional illumination of the measurement area.

When choosing, pay attention to the quality of the plastic, the absence of metal parts on the surface of the device, the availability of the batteries used (so that they can be easily found and replaced, if necessary)

Safety regulations

These are the basic rules for using electrical protective equipment and are suitable for all types:

• If special protective equipment is required, its suitability must first be checked. Firstly, attention is paid to the appearance of the device and its insulation. It must be free of dirt and damage to the outer casing, including paint.
• The suitability of each protective isolating device is also regularly checked using dedicated electrical test equipment. Therefore, before using a protective product, it is necessary to check its expiration date - the date of the next test on the stamp of the identified sample.

Device safety check

• If the electrical protection device is dirty, the housing is damaged, or the periodic test period has expired, it should not be used as this may result in electric shock.
• The electrical protective equipment to be used performs insulating functions only when dry. When it is necessary to work outdoors, it is necessary to avoid the use of protective equipment that has been exposed to moisture (rain, rain, frost, snow).
• If it is necessary to work in a damp environment, an electrical protective device specially designed for this purpose must be used.

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Application of an insulated rod

• Protective insulating pliers must be kept clean. This is also true for gloves, shoes and other protective equipment: if caustic liquids and lubricants stick to the rubber surface, they will soon become unusable.
• Insulating pliers are used to replace the fuse. In addition to insulated marking lines, insulated gloves and safety glasses or face shields should be used as an additional protective measure when replacing fuses above 1000 V.
• The load must be disconnected before replacing the fuse. The exception is network fuses, which do not have switching devices, and the fuses can be removed without disconnection.

Insulating pliers are a necessary tool when performing live work. They must be kept clean, protected from moisture and quality checked regularly. The safety of work and the life of the worker depend on this.

Which current clamps are best to buy?

Our editorial experts and experienced professionals always recommend choosing a tester model based on its functions. Even a popular European-made model will not be useful if it is not capable of producing the measurements needed in the work.

Basic functionality includes features found in both cheap and expensive pliers:

1. Chain continuity;
2. Measurement of AC current, voltage;
3. Resistance measurement.

All other options complement the base and measure:

• Constant voltage - this option significantly affects the price of the device, but expands the scope of work;
• Temperature over a wide range – models are equipped with a thermocouple; Frequency – the built-in square wave generator allows you to work closely with electronics and amplifiers.

If the device is included in the state register, it can be registered and a license to carry out work obtained.