This Hitachi catalog presents Circuit Breakers and Miniature Circuit Breakers for low-voltage distribution systems, providing comprehensive protection against overload, short-circuit, and earth leakage. The product range includes Fuse-Free Breakers, Earth Leakage Breakers, Miniature Circuit Breakers, Residual Current Circuit Breakers, and Air Circuit Breakers. These devices feature high breaking performance (e.g., Ics=100%Icu, up to 85kA for ACBs), current-limiting designs, and tripping mechanisms (thermal-magnetic, electronic) for industrial, commercial, and household applications. They ensure reliable circuit protection and system coordination, supported by a wide array of accessories.