An electrical connector includes a connector housing having a base at a rear and a plug at a front of the connector housing configured to be plugged into a busbar assembly. The plug includes a slot between a first and second plug walls that receives a busbar of the busbar assembly. The electrical connector includes power contacts received in contact channels having mating ends extending along the plug walls into the slot to mate with a busbar contacts of the busbar. The electrical connector includes a cable connector assembly coupled to the connector housing. The cable connector assembly includes a cable connector housing holding a signal contact. The signal contact is electrically connected to a signal cable of the cable connector assembly. The signal contact extending along an exterior surface of the first plug wall to interface with a signal conductor of the busbar assembly when the plug is plugged into the busbar assembly.