Generally, the current of this switch is less than 10A, and the maximum is 20A. In fact, there is also a miniature circuit breaker in the "ordinary" switch at home, which is the switch in the distribution box when entering the house.
This switch can pass the maximum current of 63A or even 100A (for industrial use). Miniature circuit breakers actually belong to "air switches".
But the real scientific name of "air switch" should be "air switch". Bigger than miniature circuit breakers are molded case switches, which can reach 1600A, and frame switches, which can reach 6300A. Of course, these are all applications below low voltage (1000V).
It is different for applications above1000 V.
2. The history of circuit breakers, the more words, the better. The earliest circuit breaker in the world appeared in 1885, which is a combination of knife switch and overcurrent release.
1905, the air switch with free tripping device was born. Since 1930, with the progress of science and technology, the discovery of arc principle, the invention of various arc extinguishing devices, the current mechanism has gradually formed.
At the end of 1950s, the rise of electronic components led to electronic release. At the end of the 20th century, due to the development and popularization of miniaturized computers, intelligent circuit breakers came out. The first generation of universal circuit breaker in China is DW2 (rated voltage AC380V, rated current 200~ 1500A) which imitates Soviet A 15, DW 1 and A2050 in 1950s. The second generation is DW6558 designed by ourselves, which is updated on the basis of DW0. The third generation is DW 15 and DWX 15 (current limiting type), which were developed in the late 1990s and put on the market in the 1980s. Their rated voltages are AC380V, 660V, 1 140V, and their rated currents are 200~4000A A.. In the early 1980s, China introduced AH and ME universal circuit breakers from Japan and Germany. The fourth generation is DW45 intelligent universal circuit breaker, which was successfully developed and put into production in the mid-1990s.
Development of molded case circuit breakers In 1950s, DZ A3 100 series molded case circuit breakers (at the level of mid-1940s) were first developed and put into production in China. At the end of 1960s, in view of the defects of DZ 1 such as large volume and low short-circuit breaking ability, the industry concentrated several major manufacturers and made drastic improvements to it, thus forming the first generation series of products DZ 10 designed by China. In the early 1980s, the second generation DZ20 series products were developed. At the same time, Shanghai Huatong Kai Guanchang and Jiaxing Electric Control Equipment Factory introduced technologies with the level of the early 1980s from Westinghouse Electric Company of the United States and Terazaki Electric Company of Japan respectively, and produced H series and TO, TG, TL series; In the 1990s, CM 1 series (Changshu Kai Guanchang), TM30 series (Tianjin Low-voltage Electric Appliance Company), JXM2 series (Jiaxing Electric Control Equipment Factory), HSM 1 series (Hangzhou Zhijiang Kai Guanchang) and S series (OTT Group composed of Shanghai Electric Appliance Research Institute, Hangzhou Zhijiang Kai Guanchang and Shanghai Huatong Kai Guanchang) were introduced. Small-sized molded case circuit breakers are DZ5- 10, DZ5-20, DZ5-25, DZ5-50, DZ 15-40, DZ 15-63, etc. Their short-circuit breaking capacity is 1~5kA plastic case circuit breaker (MCCB motor protection type), DZ5-20 (short-circuit breaking capacity is 380V, 1.5kA), DZ 15-40, DZ 15-63 (. 3ka) The short-circuit breaking capacity of M6 1 1 and 3VE 1 (with various accessories), M6 1 1 and 3VE 1 manufactured by foreign technology in 1980s is about 380V and 3ka. During the period of 1994~ 1995, Shanghai Electric Apparatus Research Institute and Xixing Electric Control Equipment Factory jointly developed DZ35 series motor protection molded case circuit breakers (models DZ35-25 and DZ35-63).
Short-circuit breaking capacity: DZ35-25 is 380 V, 3kA, 35kA and 50kA (the latter two are equipped with current limiting components), DZ35-63 is 380V, and the volume of 3kADZ35-25 is 43. 13% of that of DZ5-20, and the volume of DZ35-63 is DZ/. DZ35 series circuit breakers are equipped with modular auxiliary contacts, shunt release, under-voltage release and open-phase protection.
Motor protection circuit breakers with power greater than 30~200kW include CM 1, TM30, HSM 1, JXM2, S type and other products. Small molded case circuit breakers (MCB) now have products suitable for low-power motor protection, such as C45AD (Tianjin Meilan Rilan Company) and PX200CD (Jiaxing Electric Control Factory).
Overcurrent protection circuit breakers used in domestic households or similar places, and DZ4-25 (two-pole) plastic case circuit breakers copied by the Soviet Union (AII-25) were originally used for protection in households or similar places, but their performance was not high. In the mid-1960s, China developed DZ5 series (Grade II). In the late 1970s, German technology was introduced to produce S060 series. In the middle and late 1980s, Tianjin Meilan Rilan Company and C45N of Jiaxing Electric Control Factory introduced PX200C from German F &:G Company, which made the household protection circuit breaker reach a new level. Residual current operated circuit breaker (leakage protector) In 1950s and 1960s, China produced voltage leakage protectors in some power system maintenance plants.
Because its detection coil (or detection relay) is connected in series between the transformer neutral point and the grounding electrode, the resistance of the grounding electrode is variable, resulting in poor accuracy. In addition, the detection coil has insufficient capacity, simple structure and poor lightning protection effect, and has gradually withdrawn from application. At the end of 1960s, the first current-operated electronic leakage protector DZ5-20L was born in China (the main switch is DZ5-20 circuit breaker).
In the middle and late 1970s, the new-type (DZ 15L-40, DZ 15L-63) current-operated electromagnetic leakage circuit breakers were successfully trial-produced. There are 40A and 63A bushing currents, rated current is 6~63A, and leakage current (I δ n) IδN)30mA, 50mA, 75mA and 65438. =0. 1s), and the short-circuit breaking capacity is 380V, 3kA and 5kA. DZ 15L series has passed the national appraisal.
In 1980s, DZL 16, DZL 18, DZL29, dz 18, DZ 12L, DZL33, DZL38 and DZ10LF&; Enter the market, but most of them are current-operated electronics (integrated circuits). G company has produced fIN type (without overload and short circuit protection) (in 15, 40, 63a；; I δ n has 30,100,300,500ma) and FI/LS type (with overload and short circuit protection) (In has 2,4,6,10,20,25,32a; Iδn has 30,50,100,300ma) leakage circuit breaker. In the early 1990s, Tianjin Meilan Rilan Company produced leakage circuit breakers such as VigiC45ELE (electronic), VigiC45ELM (electromagnetic) and VigiNC 100. Leakage current (iδ N)IδN)30mA, fast type (VIGINC 100, IδN has 30mA, 300mA and 500mA.
OOT group, 1999, developed and trial-produced S-L series residual current.
3. What is the function and principle of air switch? Air switch, that is, circuit breaker, is used to connect, disconnect and carry the rated working current in the circuit, which can reliably protect the line and motor under overload, short circuit and undervoltage conditions.
The dynamic and static contacts and contact rods of the circuit breaker are designed in parallel, and the dynamic and static contacts are disconnected by using the electric repulsion generated by short circuit, which has high breaking capacity and strong current limiting characteristics. During short circuit, the aromatic insulation around the stationary contact is gasified, which plays the role of cooling and arc extinguishing, and the arcing distance is zero.
The arc-extinguishing chamber of circuit breaker adopts metal grid structure, the contact system has repulsion and current-limiting mechanism, and the circuit breaker has high breaking ability and current-limiting ability. Multiple releases.
The inverse time action is that the bimetal is heated and bent to make the release move, and the instantaneous action is that the iron core street iron mechanism drives the release to move. There are three tripping modes: thermal tripping, electromagnetic tripping and compound tripping.
When the line is short-circuited or the current is seriously overloaded, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic release generates enough suction force to attract the armature to impact the lever, so that the hook rotates upward around the rotating shaft seat and disengages from the lock catch, and the lock catch disconnects three pairs of main contacts and cuts off the power supply under the action of the reaction spring. When the line is generally overloaded, the overload current can't make the electromagnetic trip work, but it can make the thermal element generate a certain amount of heat, which will make the bimetal bend upward when heated, thus pushing the lever to disengage the hook from the lock, disconnecting the main contact and cutting off the power supply. If the main contact is closed by the operating mechanism (manual or electric), its contact system can not only connect or cut off the normal working current, but also quickly cut off the fault current several times larger than the normal working current when the fault occurs.
When the main contact is closed by the operating mechanism, it is locked in the closed position by the locking hook. If there is a fault in the circuit, the related trip will release the lock hook in the trip mechanism, so the main contact will be quickly disconnected under the action of the trip spring.
According to the different protection functions, the release can be divided into overcurrent release and pressure loss release. Under normal circumstances, the armature of the overcurrent release is released; When serious overload or short circuit fault occurs, the coil connected in series with the main circuit will generate strong electromagnetic attraction, which will attract the street rail downwards and push the unlocking hook to disconnect the main contact.
The working principle of undervoltage release is just the opposite. When the voltage is normal, electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage drops seriously or the power is cut off, the armature is released and the main contact is disconnected.
When the power supply voltage returns to normal, it must be switched on again to work, thus realizing voltage loss protection. .
4. What is an air switch? Introduction of Top Ten Brands of Air Switches After active selection by consumers, the top ten brands of Long Xing, Feidiao, Panasonic, Futian, Household, Schneider, TCL, Qisheng, Zheng Tai and Bull won awards, ranking among the top ten leading brands of switch sockets in the 20 10 China market.
The First Brand of Switch Innovation: Long Xing
Ranked first among the top ten new brands.
Switch socket, the first brand innovation. Our company has round, oval and Fiona Fang switch sockets, and the product looks very beautiful. This company was founded in 2005. The products developed by this company are really beautiful. I have seen their products, and the quality is very good, but the price is a little expensive. My colleague bought this brand for decoration, the logo is LX, and the product is really nice. It is very popular in the market at present. The new product has just been on the market for 3 months. Good appearance, good quality and high physique, and you are not afraid of expensive.
There are really no fakes on the market.
1 18 leading brand of switch socket: Feidiao 1 18 series products are not the first of its kind, but the development of 1 18 series products is closely related to the rise of Feidiao brand, even changing the market structure of electrical products in the domestic market.
120 switch socket leading brand: Panasonic
120 switch socket was introduced into China's domestic market by Panasonic Corporation in 1990s. It is unique in product appearance and internal structure technology. With its brand advantages, it has occupied a leading position in the East China market, and its excellent quality has been highly recognized by many decoration companies and users.
Surface mount switch socket brand: Futian
Surface mounted switch is famous for its high cost performance and simple installation, which is suitable for domestic third-and fourth-grade markets. Futian Electric Appliance has the ability of efficient development and innovation, and plays a decisive role in the surface mount product market.
Leading brand of steel frame switch socket: domestic
"Home" is a brand with the most complete series, the richest variety and the most professional technology in the domestic market. In terms of safety and stability, it represents the advanced technology of steel frame switch in China and has been well received and fully affirmed by consumers. Home not only embodies a certain product series, but also spares no effort to promote the concept of steel frame switch, which has made important contributions to the development of categories.
Leading brand of intelligent switch socket: Schneider Schneider Electric is recognized as an "energy efficiency management expert" in the world and is in a leading position in the market of building automation, data center and network. Schneider is committed to introducing intelligent systems into families and has made important contributions to the development of intelligent electrical products in the domestic market.
Leading brand of plastic switch socket: TCL
Since 2000, TCL plastic switch has ranked first in the market share of high-grade switch sockets in China, and won many domestic industry honors and consumer recognition. Not only that, TCL Group is a successful example of strong cooperation with the global electrical giant France Legrand, and its R&D capability continues to lead the global industry.
Leading brand of engineering switch socket: Qisheng, as an international professional brand with a history of nearly 100 years, is the first choice of domestic large-scale engineering design institutes and has made outstanding contributions to the safety performance of product structure.
Leading brand of household air switch: Zheng Tai Zheng Tai, as the leader of household air switch, has a high reputation and reputation for its reliable quality, beautiful appearance and durability, and enjoys a good reputation among domestic consumers.
Leading brand of mobile socket: Bull
With more than 20 years of production history, perfect product series, undisputed production scale advantage and stable product quality, Bull has become the undisputed preferred brand of mobile sockets.
5. What brand is the air switch? 1. schneider air switch: schneider has a history of 170 years. It is one of the top ten brands of switch sockets, and occupies a large market share in residential applications. This is a company specializing in electrical and automation management.
2.ABB air switch: ABB is a global top 500 enterprise, which was formed by the merger of Swedish Arcia (ASEA) company and Swiss BBC Brown Boveri company in 1988, and it is a leading manufacturer in the field of electric power and automation technology. 3. Zheng Tai air switch: Zhejiang Zheng Tai Electric Appliance Co., Ltd. is a manufacturer of low-voltage electrical appliances made in China.
Products sell well in more than 90 countries and regions around the world. Zheng Tai air switch is of high quality and reasonable price. 4. Siemens air switch: Siemens is a pioneer in the field of motor and electronics and a global industry. Siemens air switch is famous for its outstanding technical achievements, unremitting pursuit of innovation, excellent quality and reliable reliability.
5. China Delixi air switch: China Delixi continuously provides customers with * * products and services, not only successfully serving Shenzhou and Chang 'e, but also providing services for civilian products. Air switch, also known as air switch, is a kind of circuit breaker.
It is a switch that will automatically turn off as long as the current in the circuit exceeds the rated current. Air switch is a very important electrical appliance in low-voltage distribution network and electric drive system, which integrates control and various protection functions.
It can not only contact and break the circuit, but also protect the short circuit, serious overload and undervoltage of the circuit or electrical equipment, and can also be used for motors that are not started frequently. Main functions: Under normal circumstances, the armature of the overcurrent release is released; In case of serious overload or short circuit fault, the coil connected in series with the main circuit will generate strong electromagnetic attraction, which will attract the armature downwards and push the unlocking hook to disconnect the main contact.
The working principle of undervoltage release is just the opposite. When the voltage is normal, electromagnetic attraction attracts the armature and the main contact is closed. Once the voltage drops seriously or the power is cut off, the armature is released and the main contact is disconnected.