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              來源:http://www.cekidots.com/ 日期:2021-09-14 發布人:tongjid

              As a kind of circuit breaker, molded case circuit breaker has been widely used as frame circuit breaker. So what are the differences between these two kinds of circuit breakers in practical application? The following ABB molded case circuit breaker agent will briefly analyze it for us.
              1. The molded case circuit breaker adopts a plastic structure, which is characterized in that the shell and frame of the circuit breaker are made of plastic, and the contact and arc extinguishing system are placed in an insulating chamber to prevent short circuit between them. In order to ensure that the arc can be ejected upward and ensure the reliable breaking of the contact system. The frame circuit breaker adopts modular structure, which is divided into frame, contact arc extinguishing system, manual operating mechanism, electric operating mechanism, intelligent controller and drawer seat. And each part can become a complete and independent part. It can be fixed with only 1-2 screws during assembly. It is also very convenient for disassembly and assembly, which is convenient for its maintenance.
              2. Molded case circuit breakers have a wide variety of products, which are characterized by compact structure, easy operation, and simple structure and function. The frame circuit breaker has perfect functions, especially the wide application of single chip microcomputer technology in recent years, which makes the frame circuit breaker gradually develop in the direction of high performance, easy maintenance and networking.
              3. In terms of rated current, the rated current of molded case circuit breaker is generally below 630A, while the rated current of frame circuit breaker is much larger, generally 630a-6300a.
              4. In terms of sectioning capacity, the frame circuit breaker is higher than the molded case circuit breaker. Generally, frame circuit breakers are mostly used for circuits above 800A or circuits with high sectioning capacity requirements, while molded case circuit breakers are generally used for circuits below 630A.
              5. All parts of the frame circuit breaker are installed in an insulated metal frame, which is usually open, and can be equipped with a variety of accessories. It is also convenient to replace contacts and components, which are mostly used in the main switch at the power end. The outer contact of the grounding wire terminal, arc extinguishing chamber, release and operating mechanism of the molded case circuit breaker are installed in a plastic shell. Generally, we do not consider its maintenance. It is more suitable for the protection switch of the branch, and most of it adopts manual operation.

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