Abstract: An electrical connector arrangement including individual modules which may be assembled in a side-by-side relationship in a supporting device having spaced, opposed, inwardly inclined resilient spring fingers engageable with shoulders on the modules for holding them in place, each module including a dielectric body having cavities therein within which are pin contacts that enter socket contacts at the ends of wires inserted into the cavities. An optional lateral wire support attachment has flanges fitting within grooves in the sides of the modules. The modules are removable from the support rail by a bifurcated tool which pries the resilient fingers outwardly to free the modules, the same tool being usable to deflect the flanges of the wire support away from the grooves and allow removal of that component.