The molded case circuit breaker, as well as the frame circuit breaker, has been widely used in the current circuit breaker. So what are the differences between these two kinds of circuit breakers in the actual application process, and the following is briefly analyzed.

1. The circuit breaker is used in plastic structure, which is characteristic of circuit breaker shell and the framework is the use of plastic, and it will contact, extinguishing systems are placed in an insulated chamber, to prevent the occurrence of short circuit between them, and to ensure that the arc can up to. To ensure the reliable contact system of breaker. The frame circuit breaker adopts modular structure, which is divided into frame, contact arc extinguishing system, manual operation mechanism, electric operation mechanism, intelligent controller and drawer seat. And each part of it can become a complete and independent component. When assembling, only 1-2 screws can be fixed, so it is very convenient to disassemble and assemble. It is convenient for its maintenance.

2. Molded case circuit breaker has a wide variety of products. Its features are compact structure, easy operation and simple structure and function. The frame circuit breaker has perfect functions, especially the extensive application of single-chip technology in recent years, so that the frame breaker is developing towards high-performance, maintainable and networked.

3. In the rated current, the molded case circuit breaker is generally less than 630A, and the rated current of the frame circuit breaker is much larger, generally 630A-6300A.

4. In the breaking capacity, the frame circuit breaker is higher than the molded case circuit breaker. Under normal circumstances, most of the circuit with higher 800A or higher breaking capacity requires a frame circuit breaker, while the 630A circuit usually uses molded case circuit breaker.

5. All parts of frame circuit breaker are installed in an insulated metal frame, often open, and can be equipped with various accessories. It is more convenient to replace contacts and components, and it is mostly used in the power switch. The ground outside of the terminal contact, circuit breaker interrupter, tripping device and operation mechanism are put in a plastic shell, we generally do not consider its maintenance, it is suitable for the protection switch branch, the most used is the manual operation.