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low voltage circuit breakers are widely used in low voltage power distribution systems at all levels, to control the power of various mechanical devices, and to control and protect power connections.

• What role do low voltage circuit breakers play?

• What are the relevant parameters of low voltage circuit breakers?

• What types of low voltage circuit breakers are there?

What role do low voltage circuit breakers play?

low voltage circuit breakers refer to mechanical switching electrical appliances that can connect, charge and disconnect current under normal circuit conditions and can be connected, charged and disconnected for a specified period of time under certain abnormal circuit conditions. Perform switching operations on power distribution circuits, motors or other electrical equipment to perform a protective function according to the specified conditions. In other words, it is a switch that can automatically interrupt the circuit if overload, short circuit or undervoltage occurs during the flickering of the circuit.

low voltage circuit breakers are used to distribute current, prevent the frequent operation of asynchronous motors, power lines and motors, etc. protect and automatically shut off circuits in case of major overloads, short circuits, undervoltages and other errors and combine fuse load switches and overheating relays. In addition, no parts need to be replaced after the residual current is interrupted. It's widespread now.

What are the relevant parameters of low voltage circuit breakers?

1.The model of low voltage circuit breaker is generally composed of text symbols and numbers according to the national technical standards as follows:

2.The letter number of the product is represented by the following letters. s%)fewer oil switches; d. circuit breakers for more oil k. circuit breakers for air L. circuit breakers for sulfur hexafluoride; Z. Vacuum circuit breakers; Q. Gas generator circuit breaker; C. Arc deflection circuit breaker.

3. Installation location code; n---inside, w---outside.

4. serial number of the design series; represented by points 1, 2, 3.

5. Rated voltage, KV.

6.Other supplementary work characteristics identification, G-enhanced, F-phase separated operation.

7. Rated current, A.

8. Rated switching current, KA.

9. Special environment code. Fingers empty like DZ47-63. DZ47LE-63 with leakage. C16: refers to the current of 16A. Residents of normal households use C10-16, and the construction uses C32 or higher.

What types of low voltage circuit breakers are there?

1) (Mechanical) circuit breaker

A mechanical switchgear capable of generating, conducting and interrupting current under normal circuit conditions and capable of generating, conducting, conducting and interrupting current even under certain abnormal circuit conditions (e.g., short circuit). Formerly known as: Automatic Switch

2) Universal circuit breaker

A circuit breaker that integrates all components with a frame structure base with insulating pads and has various structural changes and uses.

Formerly known as: Frame Type Automatic Switch

3) circuit breaker with plastic housing

A circuit breaker with a housing made of molded insulating material and all components assembled in one. Synonym: compact circuit breakers

Formerly known as: Automatic switch with plastic housing

JIELI Electrical not only has a production service provider solving supply chain problems, but also a manufacturer offering OEM and ODM production services.

The miniature circuit breakers are characterized by small size, simple structure and convenient operation. The contact material of the DC miniature circuit breaker is made of copper-based alloy and has been specially treated to reduce the contact resistance and reduce the temperature coefficient.

What are the working conditions of the miniature circuit breaker?

1.The upper limit of ambient air temperature must not exceed +40℃, the lower limit must not be lower than -5℃, and the average temperature value of 24 hours must not exceed +35℃;

Note 1: If the lower limit is -10 °C or -25 °C, the user must inform the manufacturer when ordering;

Note 2: If the upper limit exceeds +40℃ or the lower limit is below -25℃, the user should negotiate with the manufacturer.

2. The height of the site must not exceed 2000 m;

3. The relative humidity of the atmosphere does not exceed 50% if the ambient air temperature is +40 °C, and at lower temperatures a higher relative humidity is allowed, e.g. 90% at +20 °C. condensation should take appropriate measures;

4. degree of pollution: 2;

5. Installation category: Class II and Class III;

6.The external magnetic field of the installation site should not exceed 5x the earth's magnetic field in any direction;

7. Generally installed vertically, with a tolerance of 2° in each direction;

8.There should be no significant vibration or vibration at the installation site.

What is the application area of miniature circuit breakers?

The miniature circuit breaker is characterized by advanced structure, reliable performance, strong switching power, beautiful appearance and compact appearance. It is mainly used in places with alternating current 50 Hz or 60 Hz, rated voltage below 400 V and rated operating current below 63 A. It is used for overload and short circuit protection of lighting, distribution lines and equipment in office buildings, residential buildings and similar buildings, and can also be used for the rare on-off operation and conversion of lines. Miniature circuit breakers are mainly used in various places such as industrial, commercial, high-rise and residential buildings.

What are the main components of the miniature circuit breaker?

The miniature circuit breaker consists of the following main parts:

1. Breakable contact connection. It consists of fixed contacts and movable contacts.

2. Equipment consisting of metal cylinders or insulating cylinders incorporating separable contact connections and arc extinguishing devices and transmissions.

3. The transmission device that drives the contact.

4. Arc extinguishing equipment.

When the miniature circuit breaker breaks the circuit, it uses a mechanical method to separate the moving contact and the fixed contact of the miniature circuit breaker. When closing, the movable contact and the fixed contact are closed by the opposite mechanical movement. During the closing and breaking of the load circuit, an arc is generated between the fixed contact and the movable contact. The arc generated during the opening process is much stronger than during the closing process. If the cut-off current is very large, especially when breaking a short circuit, the arc is very large, and it is often very difficult to disconnect the circuit.

JIELI Electrical maintains close relationships with customers in miniature circuit breaker industry, and is committed to strengthening p

roduction and operation, improving quality and safety.

The miniature circuit breaker is installed on the interrupted distribution line to effectively protect the line and electrical equipment and avoid overload operation, resulting in certain safety risks to the line and electrical equipment. From this point of view, miniature circuit breakers have a high application value, and it makes sense to actively research and develop miniature circuit breakers. For more information about information about miniature circuit breaker, please read the following words.

How is a miniature circuit breaker constructed?

Most miniature circuit breakers are frame structures, and some are assembled with discrete components. Working principle The AC operating power is rectified to obtain DC power to supply the exciter winding of the main contact coil of the miniature power switch for excitation operation; at the same time, the rotor of the miniature motor rotates through the transmission mechanism to drive the anchor, move up and down along the slip ring to close the contacts;

If the load is short-circuited or heavily overloaded, the miniature motor immediately stops rotating; When the load is restored, the miniature motor continues to work.

How do miniature circuit breakers work?

The miniature circuit breaker uses the thermal expansion of the bimetal sheet to bend the release lever so that the miniature circuit breaker triggers and plays the role of overload protection. There will be a certain time difference in overload protection. When a short circuit occurs, the current flows through the induction coil to create a strong magnetic field that pushes the lever to quickly trigger the miniature circuit breaker.

According to the various protection functions, the trigger can be divided into overcurrent trigger and power failure trigger.

If the line is generally overloaded, although the overload current cannot make the electromagnetic trigger work, the heating element can generate a certain amount of heat, causing the bimetal sheet to bend upwards during heating. Press the lever to release the hook and latch and release the main contact. The head is disconnected and the power supply is cut off.

What is a miniature circuit breaker compared to compact circuit breakers?

The current maximum current of the miniature circuit breaker is 125A. Depending on the protection class, it is divided into B, C and D types, and according to the number of poles, it is divided into 1, 2, 3 and 4-poles, which are all models with leakage protection.

compact circuit breakers currently have a maximum current of 1600 A and a maximum rated voltage of 690 V. Depending on the ignition protection type, it is divided into distribution protection and motor protection; according to the number of poles, it is generally divided into 2, 3 and 4 poles; Models with leakage protection The current is below 630A.

JIELI Electrical has been focusing on the development and production of miniature circuit breakers for several years. And it is committed to providing perfect service to every customer from all over the world.

We all know that circuit breakers play a big role in our power consumption process and can effectively ensure the safety of our power consumption. And did you know that in addition to high voltage circuit breakers, there are also low voltage circuit breakers? What role do low voltage circuit breakers play? What other species?

• What problems should be considered when using low voltage circuit breakers?

• What are the characteristics and functions of low voltage circuit breakers?

• How does the low voltage circuit breaker perform the drawer wiring?

What problems should be considered when using low voltage circuit breakers?

1. Improper installation and adjustment

Whether the installation and setting are correct is one of the basic factors affecting the normal operation of the low voltage circuit breaker. There are many operational accidents because the product is not assembled, adjusted and put into operation strictly according to the manufacturer's regulations. In general, there are three situations: (1) The auxiliary switch is set incorrectly. (2) The screw is not tightened and the pin is not opened. (3) Improper placement of the sealing ring.

2. Improper operation and maintenance as well as incorrect operation

Improper operation and maintenance of low voltage circuit breakers is another important cause of operational accidents. There are three common aspects: (1) The oil circuit breaker has too little oil. (2) Poor insulation. (3) Poor mechanical maintenance.

What are the characteristics and functions of low voltage circuit breakers?

Features:

①The low voltage circuit breaker has strong switching power.

②The low voltage circuit breaker has good protective properties and can completely disconnect the line in a very short time.

③ The free release device of the low voltage circuit breaker has a locking effect. If the line does not return to normal state and the trigger does not return to its original position, it cannot be closed and powered.

Effect:

low voltage circuit breakers can not only turn normal load current and overload current on and off, but also turn short circuit current on and off. In addition to controlling the circuit, the low voltage circuit breaker also has certain protective functions such as overload, short circuit, undervoltage and leakage protection, etc.

How does the low voltage circuit breaker perform the drawer wiring?

The input and output drawers of the low voltage circuit breaker are rotated clockwise or counterclockwise by the rocker, and the insertion structure is adopted in both the main circuit and the secondary circuit, omitting the insulator required for the fixed type Machine can be used for two purposes. which improves efficiency, facilitates operation and maintenance, and increases safety and reliability. In particular, the main circuit contact holder of the drawer floor can be used together with the fuse contact holder of type NT, so that the fuse can be used directly for power supply in an emergency.

JIELI Electrical has three production sites all over the world, namely in Poyang, Jiangxi, China, Yueqing, Zhejiang, China, and Yangon, Myanmar. The production base has passed the international ISO9000 certification for quality assurance systems.

The main components of the low voltage circuit breaker are: contacts, triggers, electrical actuators, energy release electromagnets, rotatable actuation handles, extended handles, handle locks, etc.

Which common low voltage circuit breakers do you know?

How to choose a suitable low voltage circuit breaker?

Why do we need to understand low voltage circuit breakers?

Which common low voltage circuit breakers do you know?

1) Current limit switch

A circuit breaker whose shutdown time is short enough to interrupt before the short-circuit current reaches its expected peak value.

2) Plug-in circuit breaker

A circuit breaker equipped with a plug contact (or contact seat) on the terminal to insert the corresponding static contact seat (or contact) and connect it to the external wire.

3) Circuit breakers for removal

It's some kind of pluggable circuit breaker. There is a special circuit breaker support mechanism during plug-in, which can support the circuit breaker even when the inserted contacts are in the separate position, ensuring a safe isolation distance. Drawer circuit breakers should generally have three positions: connect, test and disconnect.

4) Circuit breaker with fuse

A single electrical device consisting of a circuit breaker and a fuse, each phase being formed in series by a fuse and a pole of the circuit breaker.

5) With self-retaining circuit breaker against switching on

A circuit breaker in which the movable contacts do not conduct current, even if a command to close is given, if the conditions that caused the opening process persist.

6) Open circuit breaker

A circuit breaker that opens and closes in the open air

How to choose a suitable low voltage circuit breaker?

There are also many models of low voltage circuit breakers on the market. For example, there are dz47, which are small circuit breakers, and z20, including dw15 and so on. Different models have different applications.

When choosing, we should decide according to the current load capacity in the circuit, which type of circuit breaker to choose. You must not choose the wrong one, otherwise the circuit breaker will not play a protective role, but it will pose certain safety risks to our power consumption.

Why do we need to understand low voltage circuit breakers?

When it comes to the technical parameters of low voltage circuit breakers, most electrical professionals need to be very clear, but when it comes to the importance of the parameters of low voltage circuit breakers, many electrical professionals can be confused. low voltage circuit breakers are an important component of low voltage electrical products in the energy industry. With the further improvement of the degree of automation, the performance and service life requirements of circuit breakers are getting higher and higher, and the reliability of circuit breakers is mainly determined by their actuation mechanism. Reliability. Therefore, it is of great importance and practical value to investigate the reliability and optimal design technology of the low voltage circuit breaker drive.

JIELI Electrical has been active in the low voltage circuit breaker industry for almost twenty years. JIELI Electrical Engaged in research and development, production and supply chain management of MCB, RCCB and related supporting products.

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The miniature circuit breaker is also a circuit breaker product with a wide selection and quantity, and its main function is to protect the electrical junction distributor device of the building. It is suitable for overload and short circuit protection of AC 50/60 Hz, rated voltage 230/400 V, rated current up to 63 A, and also can be used for the rare operation and conversion of lines under normal conditions, mainly for industry, commerce, high rise and residential buildings and other places.

How does the miniature circuit breaker work?

The miniature circuit breakers consist of drives, contacts, protective devices (various triggers) and arc extinguishing systems. Its main contacts are manually operated or electrically closed. After closing the main contact, the release mechanism locks the main contact in the closed position. The coil of the overcurrent trigger and the thermocouple of the thermal trigger are connected in series with the main circuit, and the coil of the undervoltage trigger is connected in parallel with the power supply. In case of short circuit or strong overload of the circuit, the anchor of the overcurrent trigger is tightened to release the free trigger, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermocouple of the thermal trigger heats up and bends the bimetal, thereby activating the free release mechanism. In case of undervoltage in the circuit, the anchor of the undervoltage trigger falls off.

What are the installation requirements for the miniature circuit breaker?

1) The installation of the miniature circuit breaker should meet the requirements of GB13955-92 standard and product manual.

2) When installing the miniature circuit breaker, the power supply line, power supply mode, power supply voltage, and grounding type of the system should be fully considered.

3) The rated voltage, rated current, short-circuit shutdown capacity and shut-off time of the miniature circuit breaker shall meet the requirements of the protected power supply line and electrical equipment.

4) The installation and wiring of the miniature circuit breaker should be correct. Special attention should be paid to the wiring of the residual current miniature circuit breaker in single-phase, three-phase three-wire and three-phase four-wire power supply systems of different grid grounding forms.

What accessories are added to the miniature circuit breaker?

The miniature circuit breaker also adds some auxiliary measures to improve arc extinguishing performance:

(1) The arc extinguishing chamber is formed into a polygon;

(2) coating a layer of conductive carbon film on the inner wall of the arc extinguishing chamber;

(3) use graphite as an arc extinguishing agent;

(4) Increase the number of auxiliary contacts, etc.

JIELI Electrical is not only a production service provider solving supply chain problems, but also a manufacturer offering OEM and ODM production services. Do you need help with low voltage miniature circuit breakers? Fill out this form to contact us. JIELI Electrical has been active in the low voltage miniature circuit breaker industry for almost twenty years.

Jieli Electric officially moved its factory in June. The location was moved from Xiangyang Industrial Zone, Liushi Town, Yueqing City, to No. 81, Xiangbei East Road, Yishan Village, Liushi Town, Yueqing City.

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