An electrical receptacle connector is provided and includes an insulating housing, receptacle terminals, and a shield shell covering the insulating housing. The receptacle terminals, arranged in a row and disposed on the insulating housing, sequentially include a first ground terminal, a first power terminal, two first differential signal terminals, a second power terminal, and a second ground terminal. The electrical receptacle connector is capable of receiving an electrical plug connector to be inserted therein in either upside-up or upside-down directions. The electrical plug connector includes upper-row plug terminals and lower-row plug terminals arranged in 2-fold rotational symmetry. Therefore, the electrical receptacle connector using the single-row receptacle terminals and the electrical plug connector using the corresponding double-row plug terminals compose a new type of USB Type-C connectors.