First connector, second connector and electrical connector assembly

A first connector, which can be correspondingly mated with a second connector, and comprises:

• a connector main body, which comprises a first connector assembly and a housing sheathing the first connector assembly therein;
• a positioning post protruding upwardly from an upper surface of the housing and two locking protrusions positioned at two sides of the positioning post on upper surface of the housing;
• two locking protruding portions protruding from inner sides of the two locking protrusions respectively;
• an elastic latching member, which comprises a fixing portion, an elastic portion extending forwardly from the fixing portion and a latching hook provided at a front end of the elastic portion;
• the fixing portion being provided with a positioning hole to allow the positioning post to be fixed therein;
• the elastic portion being suspended above the upper surface of the housing;
• and
• a position assurance slider, which is positioned between the housing and the elastic latching member and can slide in a front-rear direction;
• the position assurance slider comprising a base, a tongue extending forwardly from the base and two locking portions provided at two sides of the tongue;
• the tongue being provided with a positioning groove which extends in the front-rear direction and allows the positioning post to be positioned therein and allows the positioning post to relatively slide therein;
• during sliding of the locking portion in the front-rear direction, the locking portion cooperating with the locking protruding portion so that the elastic latching member being in a locking state or a non-locking state;
• when the elastic latching member is in the locking state, the tongue being positioned below the elastic portion so as to prevent the elastic portion from moving downwardly, so that prevent unlatching of the latching hook.