Low-voltage circuit breakers are also called automatic air switches or automatic air circuit breakers, or circuit breakers for short. It is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against loss of voltage, undervoltage, overload, and short circuit. With the development of electrical technology, the performance of low-voltage circuit breakers has improved day by day, and has gradually realized intelligence, modularization and miniaturization, which has improved the reliability and safety of the power distribution system. However, in the process of using low-voltage circuit breakers, there are also some problems that are easy to ignore. These problems may cause unreasonable or wrong installation and use of circuit breakers. Not only can they fail to perform their control, measurement and protection functions, but there are certain hidden safety hazards. It reduces the reliability of equipment operation and poses a threat to the personal safety of users, and at the same time causes certain economic losses. How to select, install and use low-voltage circuit breakers reasonably is worthy of attention of electrical designers.
Selection principle of low-voltage circuit breaker: