A connecting device between two plate-shaped elements (2, 3), said device being adapted to be broken and comprising two substantially parallel opposite flanges (4, 5): - connecting opposite edges of said elements (2, 3) by providing together the mechanical strength of said connection, - arranging between them a groove in which a pyrotechnic fuse with an oblong section with flat flanks (10, 11) and rounded ends is housed, said flat flanks (10, 11) being substantially parallel and respectively arranged opposite said flanges (4, 5), and - each provided with a rupture area (16, 17), said rupture areas (16, 17) of both flanges (4, 5) being on the side of a same of said elements 2, 3), and being dissymetrically disposed in relation with the median plane of said device, so as not to be opposed, after a rupture resulting from the activation of said fuse, to the relative removal of said elements (2, 3) at least in part transversally relative to said flat flanks (10, 11) of said fuse, the rupture area of the flange upstream from the direction of said removal being arranged in the vicinity of the connection between, on the one side, the flat flank of said fuse opposite said upstream flange and, on the other side, the rounded end of said fuse being on the side of said rupture areas (16, 17), characterized in that: - the part of said upstream flange, being adjacent to said upstream rupture area and on the side opposite said rupture areas (16, 17), presents a larger thickness (E 18) than the one (E 21) of the corresponding part of the flange downstream from the direction of said removal, and - the rupture area of said downstream flange: ∘ is arranged in the vicinity of the top of the rounded end of said fuse located on the side of said rupture areas (16, 17), and ∘ presents a larger thickness (E 17) than the one (E 16) of said upstream rupture area, so as to compensate for the delay between the shock waves (25, 26) generated by the activation of said fuse and respectively transmitted by said flanges (4, 5) to the element being located on the side of said rupture areas (16, 17). - connecting opposite edges of said elements (2, 3) by providing together the mechanical strength of said connection, - arranging between them a groove in which a pyrotechnic fuse with an oblong section with flat flanks (10, 11) and rounded ends is housed, said flat flanks (10, 11) being substantially parallel and respectively arranged opposite said flanges (4, 5), and - each provided with a rupture area (16, 17), said rupture areas (16, 17) of both flanges (4, 5) being on the side of a same of said elements 2, 3), and being dissymetrically disposed in relation with the median plane of said device, so as not to be opposed, after a rupture resulting from the activation of said fuse, to the relative removal of said elements (2, 3) at least in part transversally relative to said flat flanks (10, 11) of said fuse, the rupture area of the flange upstream from the direction of said removal being arranged in the vicinity of the connection between, on the one side, the flat flank of said fuse opposite said upstream flange and, on the other side, the rounded end of said fuse being on the side of said rupture areas (16, 17), - the part of said upstream flange, being adjacent to said upstream rupture area and on the side opposite said rupture areas (16, 17), presents a larger thickness (E 18) than the one (E 21) of the corresponding part of the flange downstream from the direction of said removal, and - the rupture area of said downstream flange: ∘ is arranged in the vicinity of the top of the rounded end of said fuse located on the side of said rupture areas (16, 17), and ∘ presents a larger thickness (E 17) than the one (E 16) of said upstream rupture area, ∘ is arranged in the vicinity of the top of the rounded end of said fuse located on the side of said rupture areas (16, 17), and ∘ presents a larger thickness (E 17) than the one (E 16) of said upstream rupture area,