Electrical connector coupling

An electrical connector coupling, comprising:

• a first connector part having a box-shaped enveloping housing and a second connector part to be plugged into said enveloping housing along a given plug-in direction;
• said enveloping housing having two mutually opposite double-walled side walls, each of said side walls having an outer wall and an inner wall spaced apart from said outer wall and forming a gap therebetween, each of said inner walls carrying a plurality of latching hooks which are deflectable in a direction towards the respectively associated outer wall when said second connector part is inserted into said enveloping housing;
• a substantially U-shaped locking slide for securing said first and second connector parts against accidental separation, said locking slide having two mutually opposite side walls adapted to be inserted perpendicularly to the plug-in direction into said gaps formed in said enveloping housing, said locking slide thereby assuming an intermediate position along an insertion path thereof and, upon further insertion, an end position in which said locking slide secures said first and second connector parts in a proper assembly position thereof;
• said mutually opposite side walls of said locking slide having cutouts formed in respective inner wall surfaces thereof, said cutouts, in the intermediate position of said locking slide, coming to lie behind said latching hooks for permitting a deflection of said latching hooks, and said side walls of said locking slide blocking the deflection of said latching hooks in the end position thereof.