1. According to the structure
It can be divided into two types: frame type and plastic shell type. All structural elements of frame type circuit breakers are installed on the same frame or bottom plate, and there are more structural changes and more types of releases. Generally, large-capacity circuit breakers mostly adopt frame structure. All structural elements of the plastic case circuit breaker are installed in a plastic case, which is compact in structure and small in size. Generally, small-capacity circuit breakers usually adopt a plastic case structure.
2. According to the purpose
① Circuit breaker for wire protection. It is mainly used for lighting circuits and protecting household appliances. The rated current is in the range of 6～125A.
② Circuit breakers for power distribution. It is used for overload, short circuit, and undervoltage protection in low-voltage power distribution systems, and can also be used for infrequent operation of circuits. The rated current is generally 200 to 4000 amperes.
③ Circuit breaker for motor protection. In occasions of infrequent operation, it is used to operate and protect the motor. The rated current is generally 6~63A.
④Leakage protection circuit breaker. It is mainly used to prevent leakage and protect personal safety. The rated current is mostly below 63A.
3. According to performance
Divided into two types: ordinary type and current-limiting type. Current-limiting circuit breakers generally have a contact system with a special structure. When the short-circuit current passes, the contacts are repelled under the action of electromotive force to present an arc in advance, and the arc resistance is used to limit the growth of the short-circuit current. Current-limiting circuit breakers have a larger breaking capacity than ordinary circuit breakers, and can limit the effect of short-circuit current on the electrodynamic and thermal effects of the protected circuit. Low-voltage circuit breakers have a strong ability to break and make short-circuit currents. Plastic case circuit breakers with a rated current of 100A have a short-circuit making and breaking capacity of about 12 kiloamps, while current-limiting circuit breakers can reach 30 kiloamps. .