The CYM6DC molded case DC circuit breaker is suitable for use in DC power grid circuits with rated voltages ranging from DC250V to DC1000V and rated currents ranging from 10A to 1250A. The DC circuit breaker features overload long-time delay protection and short-circuit instantaneous protection functions, and is used to distribute electrical energy and protect lines and power equipment from hazards such as overload and short-circuit faults.