Electric power distribution and thus equipped vehicle on-board network

The invention relates to an electrical power distributor (1) for a vehicle electrical system, with a basic module (2) having at least one central power supply (6) and / or at least one electrical component (10) for switching a current distribution, and with a plurality universal modules (15) connected to the base module (2) are electrically connected. According to the invention, the base module (2) comprises a substantially parallelepiped-shaped, outer circumferential frame (3) having a plurality of enclosed therein receiving chambers (11) which at least partially in the direction of a vertical axis (A) of the base module (2) are open on both sides and in which universal modules (15) are accommodated. Furthermore, the invention also relates to a vehicle electrical system with such a power distributor (1).