Generally speaking, frame circuit breakers are mostly used as the main switch of the power distribution system. Circuit breaker is generally also called open circuit breaker or universal circuit breaker, and the operation mode is mostly manual operation, joystick operation, energy storage, non-energy storage aand electric operation forms. According to the installation method is divided into two types of fixed and drawer type, fixed shell using metal materials, large size and low protection level. Drawer type using engineering plastic shell, more compact structure, high protection level, easy access. According to the protection characteristics, frame type circuit breakers can be divided into non-selective (class a) and selective (class b), class b circuit breakers mostly use electronic overcurrent decoupling, with long delay, short delay and instantaneous action protection three-level protection characteristics. Intelligent frame relay circuit breaker integrated single-chip computer, with display, alarm, self-test and communication functions. It can form a monitoring system with the industrial control machine. The biggest feature of the circuit breaker is its large capacity, strong limit segmentation ability and sufficient short-time current resistance. For example, the rated current of DW17 type circuit breaker is up to 5000A, and the rated short-time withstand current is up to 100KA. The frame circuit breaker has good selectivity and stability.
Due to these excellent characteristics, circuit breakers are more expensive and are mostly used in the main switch of low-voltage distribution systems, as well as the protection of trunk lines and large motors with large important loads.
Plastic circuit breakers, also known as device circuit breakers, have all components encapsulated in a plastic enclosure, and the auxiliary contacts, undervoltage derailleurs, branch derailleurs, etc. are mostly modular. Due to the very compact structure, inspection of plastic circuit breakers requires extremely professional technical support. The operation is mostly manual, and large capacity can be selected for electric division. Due to the application of electronic overcurrent derailleurs, plastic case circuit breakers are also divided into Class A and Class B. Class B has good three-stage protection characteristics, but due to price factors, the market share of Class A products with electromagnetic type derailleurs is higher.
Plastic circuit breakers are characterized by small size, good contact protection, easy installation and low price, for small and medium-sized power distribution, plastic circuit breakers are completely satisfactory.
Above, the difference between plastic circuit breakers and frame circuit breakers is introduced here. However, it should be noted here that both frame circuit breakers, and plastic circuit breakers, mainly need to be combined with their own actual situation to determine, as long as the required rated safety factor of 1500A or less, and have a relatively high quality and environmental adaptability, Taisi Electric plastic shared
