Miniature circuit breakers (MCBs) and standard circuit breakers protect electrical circuits in Australian homes from overload or short circuits. The key difference is their size and application scope. MCBs are compact, designed for smaller, more specific current ratings, commonly used in modern domestic electrical distribution boards. They replace the older-style fuses and provide an easier reset mechanism when tripped, without the need to replace components. In contrast, standard circuit breakers are larger, and typically used for higher current applications, or where more advanced protection features are required.