6 into the receiving opening 8 complementarily provided as bore hole is facilitated by a conically extending tip 20 arranged on the end side of the main guide pin 6 on each side in the outer lateral peripheral areas of plug 1 one centering pin 7 a 7 b respectively is shown the line contacts 1 a of the plug 1 are located on each side of the main guide pin 6 between the main guide pin 6 and the respective centering pin 7 a 7 b the main centering pin 6 and the centering pin 7 a 7 b form the guide elements 4 of the plug 1 the socket 2 has two receiving openings 9 for a positive reception of the centering pins 7 a 7 b the receiving openings 9 both open out via a breakout 11 into the associated lateral wall face 10 moreover also on the plug 39 s 1 side facing the socket 2 line contacts 1 b are arranged which in the provided alignment of the plug halves 1 2 are exactly opposite to the line contacts 1 a and receive the same the receiving openings 8 9 form the guide elements 5 of the socket 5 fig2 shows a horizontal cross section through the plug 1 and the socket 2 additionally illustrated is a pivot wedge 3 arranged thereabove on the lower side of.