An electrical terminal block connector is provided for connecting a plurality of power supply conductors having a first cross-sectional area and a plurality of data input conductors having a smaller cross-sectional area with a plurality of output conductors having a uniform cross-sectional area. The connector includes a terminal block housing containing a chamber, first and second inlet openings communicating with the chamber for receiving the ends of the power conductors and the data conductors, respectively, and a plurality of outlet openings communicating with the chamber for connection with the ends of the output conductors, respectively. First and second connector devices are arranged in the chamber for connection with the ends of the power and data conductors, respectively, and a plurality of identical third connectors connected with the first and second connectors include tulip-shaped terminals that extend within corresponding outlet openings for connection with the output conductors, respectively. The first connectors include resilient terminals connected by buses with the third connectors, and the second connectors include a data socket having outlet terminals connected with the third connectors via the conductors of a printed circuit board, respectively.