A device to provide an electrical connection between a power generator integral with a weapon and a first contact area integral with a piece of ammunition, said device comprising a conductive rod carried by a breech of the weapon and able to translate with respect to said breech in order to come into contact with said first contact area of said ammunition, said rod incorporating a pointed end ensuring the deformation of said area wherein said rod has a rack onto which meshes a pinion integral with said breech, said pinion being driven in rotation by drive means actuated when said breech is closed.