An electrical connector comprising: a housing having a pin plate holder and a pin block holder; the pin block holder having a pin block holder stabilizing section, the pin block holder stabilizing section having a stabilizing recess which extends from a front wall of the pin block holder, the pin plate holder having a pin plate holder stabilizing portion, the pin plate holder stabilizing portion having a stabilizing projection, the stabilizing projection having a first surface, an oppositely facing second surface and side surfaces which extend between the first surface and the second surface; and terminals positioned in terminal receiving openings of the pin block holder, the terminals having mating portions positioned in terminal receiving openings of the pin plate holder; characterised in that: (i) the pin block holder has ribs (46, 48, 50) that extend into the stabilizing recess from walls (38, 40, 42) of the stabilizing recess; and with the pin block holder and the pin plate holder fully mated, the ribs (46, 48, 50) of the pin block holder stabilizing section engage the stabilizing projection of the pin plate holder stabilizing portion to prevent the movement of the stabilizing projection and the pin plate holder relative to the stabilizing recess and the pin block holder in directions which are perpendicular to longitudinal axes of the ribs (46, 48, 50); (ii) the pin block holder stabilizing section has latching arms which extend from the front wall of the pin block holder toward a back wall, the latching arms extend in a direction which is essentially parallel to a plane of the mating portions of the terminals; and (iii) the pin plate holder stabilizing portion has latching projections which extend from walls of the pin plate holder, each of the latching projections extend in a direction toward the stabilizing projection, and wherein the latching projections have lead-in surfaces and locking surfaces, wherein with the pin block holder and pin plate holder fully mated, the latching arms of the pin block holder are prevented from movement relative to the pin plate holder in the direction of insertion by the engagement of the locking surfaces of the latching projections with free ends of the latching arms and by the engagement of an over insertion prevention wall with leading ends of the latching arms. a housing having a pin plate holder and a pin block holder; the pin block holder having a pin block holder stabilizing section, the pin block holder stabilizing section having a stabilizing recess which extends from a front wall of the pin block holder, the pin plate holder having a pin plate holder stabilizing portion, the pin plate holder stabilizing portion having a stabilizing projection, the stabilizing projection having a first surface, an oppositely facing second surface and side surfaces which extend between the first surface and the second surface; and terminals positioned in terminal receiving openings of the pin block holder, the terminals having mating portions positioned in terminal receiving openings of the pin plate holder; (i) the pin block holder has ribs (46, 48, 50) that extend into the stabilizing recess from walls (38, 40, 42) of the stabilizing recess; and with the pin block holder and the pin plate holder fully mated, the ribs (46, 48, 50) of the pin block holder stabilizing section engage the stabilizing projection of the pin plate holder stabilizing portion to prevent the movement of the stabilizing projection and the pin plate holder relative to the stabilizing recess and the pin block holder in directions which are perpendicular to longitudinal axes of the ribs (46, 48, 50); (ii) the pin block holder stabilizing section has latching arms which extend from the front wall of the pin block holder toward a back wall, the latching arms extend in a direction which is essentially parallel to a plane of the mating portions of the terminals; and (iii) the pin plate holder stabilizing portion has latching projections which extend from walls of the pin plate holder, each of the latching projections extend in a direction toward the stabilizing projection, and wherein the latching projections have lead-in surfaces and locking surfaces, wherein with the pin block holder and pin plate holder fully mated, the latching arms of the pin block holder are prevented from movement relative to the pin plate holder in the direction of insertion by the engagement of the locking surfaces of the latching projections with free ends of the latching arms and by the engagement of an over insertion prevention wall with leading ends of the latching arms.