① Divided into overcurrent protection and over-temperature maintenance. Circuit breakers used for overcurrent protection are commonly referred to as circuit breakers (also known as overcurrent protection circuit breakers). Those used for over-temperature maintenance are typically called thermal circuit breakers. Thermal circuit breakers are categorized into low-melting point alloy types, temperature-actuated types, and memory metal types, among others. Thermal circuit breakers are designed to prevent overheating of heating appliances or those that are very prone to overheating, such as hair dryers, irons, electric rice cookers, heaters, transformers, and motors. They respond to the rise in electrical temperature and do not ignore the operating current of the power circuit. Their principle differs from that of overcurrent protection circuit breakers.

② Includes power engineering fuses, CNC lathe fuses, electrical instrument panel fuses (electronic device fuses), vehicle fuses, etc.

③ Available in large, medium, small, and micro sizes.

④ Available in high-voltage, low-voltage, and working voltage circuit breakers.

⑤ Available in high and low breaking capacity fuses.

⑥ Available in various shapes, including round-tube fuses (which can be further categorized into internal and external soldered fuses), pointed tube fuses, wire cutter fuses, spiral fuses, software fuses, tablet PC fuses, encapsulated fuses, and surface mount fuses.

Breakers are categorized by their disconnection speed, including Extra Slow Breakers (commonly denoted as TT), Slow Breakers (commonly represented by T), Medium Speed Breakers (commonly indicated by M), Fast Breakers (commonly denoted as F), and Direct Fast Breakers (commonly indicated as FF).

⑧ The circuit breakers can be categorized as European-standard, American-standard, and Japanese-standard models.