Generally speaking, frame circuit breakers are mostly used as main switches in power distribution systems. Circuit breakers are generally also known as open circuit breakers or universal circuit breakers, and are operated mostly in the form of manual operation, joystick operation, energy storage, non-energy storage and electric operation. According to the installation method is divided into fixed and drawer type two, fixed type shell using metal materials, large size, low protection level. The drawer type uses engineering plastic shells, which are more compact, with a high level of protection and easy access. According to the protection characteristics, frame type circuit breakers can be divided into non-selective (category a) and selective (category b). category 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 be used with industrial control machines to form a monitoring system. The biggest feature of the circuit breaker is its large capacity, strong limit segmentation capability and sufficient short-time resistance to flow. For example, the DW17 type circuit breaker has a rated current of up to 5000A and a rated short-time withstand current of 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 as main switches in low-voltage distribution systems, as well as for 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 striker and branch striker are mostly modular. Due to their very compact construction, inspection of plastic circuit breakers requires extremely specialised technical support. Operation is mostly manual, with electric splitting options available for large capacities. 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 the price factor, Class A products with electromagnetic type derailleurs have a higher market share.

Plastic circuit breakers are characterised by their small size, good contact protection, ease of installation and low price. For small to medium sized power distribution, plastic circuit breakers are completely satisfactory.

Above, the differences between plastic and frame circuit breakers are described 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 safety rating is below 1500A, and there is a relatively high quality and environmental adaptability, Taisi Electric plastic shared