The YJB1Z-63 series DC mini-circuit breakers (hereinafter referred to as circuit breakers) are suitable for circuits with rated currents of 63A or less and DC rated voltages of 250V and 440V. They are used for overload and short-circuit protection of facilities and electrical equipment in DC power distribution systems and can be widely used in industries such as power, telecommunications, transportation, and industrial and mining enterprises. This product meets the requirements of GB10963.2 and IEC60898-2 standards.