The invention proposes a connecting assembly including a frame, a contact receptacle (hereafter ‘receptacle’) of an electrical connector and a contact header (hereafter ‘header’) of a counterpart electrical connector to be plugged into the electrical connector according to a plugging direction, wherein it is arranged such that the header and the receptacle can be both independently pushed into the plugging direction with respect to the frame, and wherein it further includes: first stopping means arranged for stopping the header on the receptacle if the header is pushed according to the plugging direction with a force that is lower than to a first force limit F2, and for being gone beyond if said force is greater than F2 such that the header and the receptacle are then connected together; second stopping means arranged for stopping the receptacle on the frame if the receptacle is pushed according to the plugging direction with a force that is lower than a second force limit F3, and for being gone beyond if said second force is greater than F3 such that the receptacle is then mounted to the frame; wherein F3 is greater than F2.