The invention relates to a switcher for product supply lines, which comprises a support frame (2), a guide channel (8) which is transversally mobile on the support frame (2) with respect to the advancing direction of the products being supplied in inlet. The switcher (1) comprises a telescopic channel (10), located at an end (9) of the guide channel (8), and being slidably mobile with respect thereto. The guide channel (8) is mobile by a support element (6), slidable on respective transversal portions (4, 5) of the support frame (2). The support element (6) is in turn activated by cooperation between a cursor (13), slidable on the support element (6), and a con rod (15), hinged both to the cursor (13) and to a fixed transversal portion (4) of the support frame (2). The guide channel (8) is further provided with a separator device (20) for controlled distancing of the products which are grouped during the input supply stage.