Abstract: A modular wire feeding device includes a wire feeding block with an electric motor and a planetary wire feeding head disposed in an electrically insulating casing. To the front shield of the electric motor there is rigidly fastened a current and water conducting pipe, a water outlet and gas inlet pipe connected to a front and rear flange. To the rear shield of the electric motor there is mounted an insulating flange which connects the wire feeding device to the wire supply part of a welding hose. The external surfaces of the front, rear, and insulating flanges are shaped as guides of the insulating casing. The casing is made up of two parts with openings provided for the manipulation of the wire feeding head. Above the openings and movably mounted on the insulating casing there is mounted a protective cover for the openings in the casing.