Circuit Breaker is a switching device that can close, carry and break current under normal circuit conditions and can close and carry current under the abnormal loop conditions within a specified time.
The circuit breaker is generally composed of a contact system,an arc extinguishing system, an operating mechanism,a trip unit,a casing,and so on.Our company's Circuit Breakers had been divided into 11 series(as follow),every series product have it's own special function,had exported into global market for many years,always with good feedback.
Mini Circuit Breaker Circuit Breakers,Air Circuit Breaker,Earth Leakage Circuit Breaker,Moulded Case Circuit Breaker Ningbo Bond Industrial Electric Co., Ltd. , https://www.bondelectro.com
It is reported that China's standardization construction started relatively late. Before that, there was no unified standard for the construction of power supply and distribution facilities in residential areas in the country. There were no such standards in other areas. When building power supply and distribution facilities in new residential areas, only relevant Design specifications for urban residential area planning, housing, power supply and distribution systems, and low-voltage power distribution are carried out. Due to the lack of pertinence and authority of the design requirements of the power supply and distribution facilities, and the developers' efforts to save investment and maximize profits, the configuration level of power supply and distribution facilities in a large number of newly built residential areas is too low, although for a short time. Due to the occupancy rate and the low level of electricity consumption of residents, the normal electricity consumption of households will not cause much problems. However, with the passage of time, especially the increase of electricity capacity in residential areas, the allocation level is too low. It will be exposed that the legitimate rights and interests of residents to obtain reliable power supply will be infringed, which will lead to social contradictions and affect the construction of a socialist harmonious society. Therefore, it is necessary to introduce and implement standards for the construction of power distribution facilities in residential areas.
According to reports, Jiangsu "Standards for the Construction of Power Supply and Distribution Facilities in Residential Areas" complies with the guidelines and policies of the State and our province on the construction of power supply and distribution facilities in residential areas, in accordance with the "Code for Design and Design of Urban Residential Areas" and "Design Specifications for Power Supply and Distribution Systems". Relevant standards, standards and guidelines of the countries and provinces such as "Jiangsu Province Residential Design Standards" are based on the research results of other provinces and cities, combined with the actual situation in Jiangsu. The main contents include general rules, terminology, power supply and distribution design, Five parts of five chapters, such as equipment selection, construction and acceptance, and appendix. The "standard" has made specific provisions on the overall planning of power supply and distribution in the residential area, power supply plan review, design, construction and installation, completion acceptance, etc., and clearly requires that the construction of power supply and distribution facilities in residential areas must comply with the state and The relevant technical standards of the industry adopt equipments that are safe, reliable, advanced in technology, easy to maintain, simple in operation, energy-saving and environmentally friendly. The "standard" specifically defines the basic allocation capacity of residential residential electricity, with a building area of ​​120 and below, 120 to 150 and 150 square meters or more, respectively, 8, 12 and 16 kilowatts, and also includes 4 residential areas. Typical design of power supply.
In order to effectively protect the legitimate rights and interests of the owners of residential areas to obtain reliable power supply, Jiangsu Electric Power Company issued a special notice on September 30, requiring all units to quickly organize the study of “standardsâ€, accurately understand its contents, and actively develop with residential areas. , design, construction and other units to get in touch, strengthen publicity and conscientiously implement. (Shen Weimin, Kaining)
The authenticity of this information has not been confirmed by the international electrical network, for your reference only. 
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Air Circuit Breaker
Jiangsu Implementation of "Standards for the Construction of Power Supply and Distribution Facilities in Residential Areas"
The reporter learned from the Jiangsu Electric Power Company on October 10 that the first standard for regulating the construction of power supply and distribution facilities in residential areas - the construction standards for power supply and distribution facilities in Jiangsu's residential areas, has recently passed the provincial construction department and provincial economic trade. The committee passed the examination and approval, and was officially issued in the province as a mandatory standard for Jiangsu engineering construction. Since then, the problem that the supply and distribution facilities in a large number of newly built residential areas are too low and the reliable supply of electricity is difficult to guarantee is expected to be satisfactorily resolved in Jiangsu.