The utility model provides a conventional circuit -breaker operating device, belongs to the low -voltage electrical equipment field. Including a pair of curb plate, switch -on half shaft, combined floodgate latching assembly and cam pack, switch -on half shaft and cam pack all rotate the setting between a pair of curb plate, and characteristics are: combined floodgate latching assembly includes first hasp lever and second hasp lever, and first hasp lever and second hasp lever all rotate the setting between a pair of curb plate, the action of the first hasp lever of switch -on half shaft control, the action of first hasp lever control second hasp lever, the action of second hasp lever control cam pack. Owing to adopted first, second hasp lever to lever operation relation through the two -stage, the final hasp lever of winning that makes can reduce to the size of switch -on half shaft's pushing force by a wide margin, and then the tripping force when having reduced that closing hinge rotates, makes closing operation more light, reliably.