Abstract: A modular electrical connector including an elongate housing defining at least two laterally spaced, generally parallel rows of equally spaced contact supporting cavities. The cavities in each row are in longitudinal positions offset relative to the longitudinal positions of corresponding ones of the cavities in the opposite row. Equal numbers of cavities are provided in each row, and the break-away walls are located for separating the cavities into modules of varying numbers of sets of cavities with one cavity in each set being from each row. The break-away walls are located between adjacent cavities in each row, and rigid supporting walls extend laterally between each opposing cavity of each set. The cavities have common mating ends and conductor terminating ends, with the conductor terminating ends of all the cavities having access slots on one side of the connector for receiving conductors therethrough for termination to appropriate insulation displacement contacts supported in the cavities.