The invention relates to a suspension device of at least one reactor module to a test bench comprising at least one suspension arm, at least one upstream fixing assembly adapted to be fixed to a ceiling or wall of the test bench, at least one downstream fixing assembly adapted to be fixed to a reactor module, said suspension arm extending between two attachment ends adapted to be respectively fixed to the upstream fixing assembly and to the downstream fixing assembly, characterized in that said arm has a flexible median area whereof at least one cross-section dimension is less than the same cross-section dimension at the level of the attachment ends, the downstream casing comprising a fall-protection device.