Connector assembly for connection under voltage

A connector includes a first connection element (2) provided with a portion of greater diameter (9) upstream to a portion of smaller diameter (10) and a second connection element (3) provided with a female contact element (14, 16) including a local narrowing of diameter (20), the narrowing being upstream to a contact piece (14) housed at the bottom of a cavity. During the connection between the two connection elements, the portion of greater diameter of the male contact element comes into contact with the local narrowing of diameter of the female contact element in the corresponding cavity, before the portion of smaller diameter of the male contact element comes into contact with the contact piece housed at the bottom of the cavity.