Device for fitting a substrate with electrical components which can be provided, with - a base plate, and with - at least one fitting head for manipulating the components, wherein - the substrate can be transported in longitudinal direction (x) by the device, and can be fixed in a fitting region of the device, - the components can be provided in at least one collection region of the device, - the fitting head can be displaced between the collection region and the fitting region, - a guide arm extending in longitudinal direction (x) is displaceably housed, transverse to the longitudinal direction (x), on the base plate, - the guide arm has a linear first guide track extending in longitudinal direction (x) passing between its end faces, in which track linear bearings of the fitting head, compatible therewith, engage, - two guide elements with second guide tracks compatible with the first guide track are housed on both sides of the longitudinal region of the guide arm at the base plate, which elements extend parallel to the first guide track outside of the fitting region at the same height as the first guide track of the guide element, - the guide arm can be displaced in a defined hand-over position in which the first guide track and the two second guide tracks are flush to one another, - each of which directly adjoin ends of the first and second guide tracks (11, 11a) facing one another, and wherein - the fitting head can be displaced over the end of the guide arm onto the adjoining second guide track, wherein - a further fitting head, which can be displaced independently of the other fitting head, is guided into the guide tracks (11, 11a), - an operating state is possible in which at least occasionally one of the two fitting heads is housed exclusively on the first guide track and the other is housed exclusively on one of the second guide tracks, and wherein in another operating state, in which the guide arm is in the hand-over position, the fitting head located on the second guide track can be shifted onto the first guide track of the guide arm and simultaneously the fitting head housed on the guide arm can be shifted onto the opposing second guide track; - the guide elements are displaceably housed in the longitudinal direction (x) at the base plate, and - after removing the guide arm from the region of the guide elements, these are shifted into an overlap region with the first guide track. - a base plate, and with - at least one fitting head for manipulating the components, wherein - the substrate can be transported in longitudinal direction (x) by the device, and can be fixed in a fitting region of the device, - the components can be provided in at least one collection region of the device, - the fitting head can be displaced between the collection region and the fitting region, - a guide arm extending in longitudinal direction (x) is displaceably housed, transverse to the longitudinal direction (x), on the base plate, - the guide arm has a linear first guide track extending in longitudinal direction (x) passing between its end faces, in which track linear bearings of the fitting head, compatible therewith, engage, - two guide elements with second guide tracks compatible with the first guide track are housed on both sides of the longitudinal region of the guide arm at the base plate, which elements extend parallel to the first guide track outside of the fitting region at the same height as the first guide track of the guide element, - the guide arm can be displaced in a defined hand-over position in which the first guide track and the two second guide tracks are flush to one another, - each of which directly adjoin ends of the first and second guide tracks (11, 11a) facing one another, and wherein - the fitting head can be displaced over the end of the guide arm onto the adjoining second guide track, wherein - a further fitting head, which can be displaced independently of the other fitting head, is guided into the guide tracks (11, 11a), - an operating state is possible in which at least occasionally one of the two fitting heads is housed exclusively on the first guide track and the other is housed exclusively on one of the second guide tracks, and wherein in another operating state, in which the guide arm is in the hand-over position, the fitting head located on the second guide track can be shifted onto the first guide track of the guide arm and simultaneously the fitting head housed on the guide arm can be shifted onto the opposing second guide track; - the guide elements are displaceably housed in the longitudinal direction (x) at the base plate, and - after removing the guide arm from the region of the guide elements, these are shifted into an overlap region with the first guide track.