A connection assembly comprising a first connector housing having at least one blocking element in relief, and a second housing comprising a housing body extending along a longitudinal axis and a locking cap movable relative to the housing body of the second housing perpendicularly to the longitudinal axis between a locked position and an unlocked position. The locking cap includes at least one blocking ramp in which the blocking element in relief of the first housing is capable of sliding. The housing body of the second housing presents at least one setback in its outside surface that corresponds substantially to the thickness of the locking cap in order to receive the locking cap in its locked position.