Lockable flat plug sleeve for an electrical connector

A plug connector for contacting a device having a plurality of contacts and comprising flat plugs;

• said plug connector comprising:
• a combination of a lockable flat plug sleeve and an insulation displacement contact;
• a flat plug;
• said lockable flat plug sleeve comprising a bottom plate and two upwardly extending sidewalls connected to opposite sides of said bottom plate and having a longitudinal extension parallel to said opposite sides of said bottom plate;
• each one of said sidewalls having a free upper edge bent so as to extend toward one another;
• said bottom plate, said sidewalls, and said free upper edges delimiting a compartment for receiving said flat plug;
• said bottom plate comprising a locking member and said flat plug comprising a cutout;
• said locking member engaging said cutout for locking said flat plug in said flat plug sleeve upon insertion of said flat plug into said flat plug sleeve;
• said flat plug sleeve having a release device for releasing said locking member from engagement with said cutout;
• one of said sidewalls having an elongated end projecting past said bottom plate in a direction of said longitudinal extension;
• said elongated end being bent so as to have a free end extending at a right angle to said sidewall, wherein said free end is said insulation displacement contact and has a forked spring with an insertion slot.