Connection assembly having multi-contact connectors with a polarizing system using keys

A connection assembly comprising:

• a first connector;
• a second connector of type complementary to the first connector, the first and second connectors each comprising a housing extending along a first axis and having a connection face, the first and second connectors being connected together via their connection faces;
• and
• at least one coupled-together pair of two polarizing keys, each key being of elongate shape along a second axis and projecting from one of the housings beyond its connection face;
• wherein each opposite ends of each key includes a portion with a peripheral surface that is provided with at least one projecting and/or hollow shape,
• wherein each end portion of one of the two keys is adapted to engage via complementary shapes with a single end portion of the other of the two keys along their coinciding axes and in only one relative angular position between them, and
• wherein each key is adapted to be fastened via one or the other of its end portions to the housing of the first and/or the second connector in a plurality of given angular positions around the first axis.