A hybrid power distribution central unit for vehicles, characterized by a modular unit comprising, inside it, a plurality of seats S1-n of equivalent dimensions and capable of receiving at least one of a plurality of functional modules (12, 13, 14) of different types in respective one or more adjacent seats, wherein the hybrid power distribution central unit comprises a housing box defined by a base, side walls, front and rear walls and cover, by defining internally a plurality of seats (S1-n) for coupling the functional modules (12, 13, 14), wherein each of the front and rear walls of the housing box has internally a pair of grooves by seat (S1-n), and each pair of grooves being able to receive a respective pair of couplings of any one of the functional modules (12, 13, 14), and wherein the at least one of the plurality of functional modules (12, 13, 14) has a width equal to N times a width of the seat (S1-n) with n being an integer greater than or equal to 2, has N pairs of first couplings, and occupies N adjacent seats of the housing, and wherein on the outside of the front wall of the housing box, directly below the lowered region of the housing box, there are provided second couplings in order to couple a the power supply module, and wherein the power supply module has inverted L-shape form, and the power supply module comprises: - a busbar, in the form of a metal plate, on which the electrical contacts (33, 34) are fixed, said electrical contacts (33, 34) having respective holes capable of coupling themselves, by fitting and thread coupling, to the pins for the contacts of the functional modules; - a support structure that has a shape so as to receive the pins; - projections of the structure disposed on the sides of the power supply module and intended to receive and couple a cover supporting the busbar. wherein the hybrid power distribution central unit comprises a housing box defined by a base, side walls, front and rear walls and cover, by defining internally a plurality of seats (S1-n) for coupling the functional modules (12, 13, 14), wherein each of the front and rear walls of the housing box has internally a pair of grooves by seat (S1-n), and each pair of grooves being able to receive a respective pair of couplings of any one of the functional modules (12, 13, 14), and wherein the at least one of the plurality of functional modules (12, 13, 14) has a width equal to N times a width of the seat (S1-n) with n being an integer greater than or equal to 2, has N pairs of first couplings, and occupies N adjacent seats of the housing, and wherein on the outside of the front wall of the housing box, directly below the lowered region of the housing box, there are provided second couplings in order to couple a the power supply module, and wherein the power supply module has inverted L-shape form, and the power supply module comprises: - a busbar, in the form of a metal plate, on which the electrical contacts (33, 34) are fixed, said electrical contacts (33, 34) having respective holes capable of coupling themselves, by fitting and thread coupling, to the pins for the contacts of the functional modules; - a support structure that has a shape so as to receive the pins; - projections of the structure disposed on the sides of the power supply module and intended to receive and couple a cover supporting the busbar. - a busbar, in the form of a metal plate, on which the electrical contacts (33, 34) are fixed, said electrical contacts (33, 34) having respective holes capable of coupling themselves, by fitting and thread coupling, to the pins for the contacts of the functional modules; - a support structure that has a shape so as to receive the pins; - projections of the structure disposed on the sides of the power supply module and intended to receive and couple a cover supporting the busbar.