Receptacle connector, plug connector and electrical connection device

An electrical connection device, comprising:

• a receptacle connector, comprising:
• a metal shell;
• an insulative base provided in the metal shell and comprising an insertion opening;
• and
• a receptacle terminal assembly provided in the insulative base and comprising two terminal bases, a protective base which is provided between the two terminal bases, and two receptacle terminal groups which are respectively provided to the two terminal bases, the protective base and the two receptacle terminal groups being spaced apart from each other, each receptacle terminal group extending toward the insertion opening and below a top of the protective base;
• a plug connector, separably mating with the receptacle connector, and comprising:
• a plug housing unit, comprising a housing peripheral wall which defines an inserting space, and two first protecting walls which connect the housing peripheral wall, the inserting space comprising an inserting opening, the two first protecting walls being adjacent to the inserting opening and extending toward each other to cooperate with each other and define an insert opening;
• and
• two plug terminal groups, each plug terminal group comprising a tip, each tip being sheltered by the respective first protecting wall so that the tip is not exposed in the insert opening.