A flat contact socket comprises a connection section and a socket body connected to the connection section. The socket body has a flat contact receptacle and a blocking element. The flat contact receptacle extends along a flat contact plane and receives a flat contact in an insertion direction at an insertion opening of the flat contact receptacle. The blocking element is positioned opposite the insertion opening in the insertion direction and delimits the flat contact receptacle in the insertion direction. The blocking element extends transverse to the insertion direction from a cantilever extending in the insertion direction.