The present invention concerns an electrical connector which can be plugged into a mating electrical connector along a plug-in direction, as well as an assembly comprising a compression spring (16) and a one-piece housing (12) comprising a recess (34) which is sized to receive the compression spring (16). The electrical connector further comprises a position assurance element (18) of the connector, termed the "CPA", with a head (44) configured so as to be disposed in the recess (34) and the head (44) is inserted through a first end (42) of the compression spring (16). When being plugged in, the first end (42) of the compression spring (16) exerts a force on the position assurance element (18) of the connector only, the position assurance element (18) exerting a force on the one-piece housing (12), and a second end (56) of the compression spring (16), which is opposite to the first end (42) along the longitudinal axis (A) of the spring, exerts a force on only the recess (34) of the one-piece housing (12).