1. "N" stands for indoor installation and use;
2. "W" stands for outdoor installation and use.
The third digit in the circuit breaker model represents the company’s design sequence number, the fourth digit is the rated voltage in KV, the fifth letter indicates the type of function: including G improved type, F split-phase operation, and the sixth digit is the rated current The unit is ampere (A), the seventh digit is rated breaking current (KA), and the eighth digit indicates the special environmental code of the circuit breaker.
1. Types of low-voltage circuit breakers: miniature circuit breakers, molded case circuit breakers, leakage circuit breakers, universal circuit breakers, frame circuit breakers, motor circuit breakers, etc.;
2. Types of high-voltage circuit breakers: high-voltage SF6 circuit breakers, high-voltage vacuum circuit breakers, outdoor high-voltage vacuum circuit breakers, indoor high-voltage vacuum circuit breakers, etc.
In electricity, the circuit breaker symbol is often represented by QF, and the molded case circuit breaker, which is related to the protection switch, is represented by the symbol QS. Among them, the static contact of QF has X and can be operated with load, while the static contact of QS has "—", so it cannot be operated with load. The circuit breaker symbol "Q" refers to power circuit switching equipment, while the symbol "F" means protection equipment, and the letter "S" is the difference from an isolating switch. The circuit breaker refers to the ability to close and close, withstand the load overload, and break the current under normal loop conditions. At the same time, it must also be able to carry and break abnormalities within the specified time during the execution of the closing action. The role of current switching devices under loop conditions.