High voltage low current connector interface with compressible terminal site seal

A high voltage electrical connector assembly having a first connector (12) with socket terminals (44), matable with a second connector (14) having pin terminals (58). Socket terminals (44) are disposed in respective gradually tapered silos (40) of elastomeric material, and the second connector (14) is formed of rigid dielectric material to include silo-receiving recesses (50) surrounding the pin contact sections (56) of the pin terminals (58). Each silo (40) includes a leading end portion extending a selected distance beyond the socket contact section leading end (72) and abuts the recess bottom (96) prior to full connector mating. Upon completion of connector mating, the silos (40) are longitudinally compressed at their leading end portions (74) and thereby become radially expanded to tightly engage the inner surfaces (128) of the silo-receiving recesses (50) and establish compression seals (130) therewith therealong to define sealing of the mating interface against voltage leakage paths that otherwise would permit generation of corona.