Patent ID: 8842407

Claim:
A Medium Voltage circuit breaker wherein it comprises an insulating base frame supporting: a pole assembly having, for each phase, an interruption unit housing a fixed contact and a movable contact reciprocally couplable/uncouplable between an open and a closed position; an actuator to actuate the opening and closing operation of said circuit breaker; and, a control and diagnostic unit comprising a control box having a casing housing a plurality of accessory devices of said circuit breaker; wherein said pole assembly, said actuator and said control box housing are pre-assembled and then mechanically fixed to said insulating base frame at one side of said insulating base frame; wherein said control box comprises an insulated casing, which is separated from said insulating base from and a cover that configured to couple with said insulating casing to define an enclosed environment for the accessory device; wherein said control box comprised co-molded wirings and connections in said insulating frame, into which the accessory devices can be plugged and unplugged; wherein said control box comprises at least a co-molded connection of a plug-socket type for connection with a corresponding at least a co-molded connection of the plug-socket type, which is comprised in said insulating frame.