The　protection　of　non-structural　elements　is　having　an　increasing　interest　in　the　scientific　literature.　Many　non-structural　elements　undergo　to　a　rocking　motion　when　they　are　subjected　to　base　excitation.　For　instance,　cabinets　and　racks　for　both　civil　and　industrial　use　fall　into　this　class.　This　paper　aims　to　improve　the　dynamic　and　seismic　behaviour　of　a　rocking　body　under　base　excitation　by　reducing　the　amplitude　of　the　rocking　motion　and　consequently　reducing　the　likelihood　of　their　overturning.　To　achieve　such　objective,　the　body　is　modelled　as　an　assembly　of　rigid　parts　connected　with　deformable　devices　that　allow　the　body　to　change　its　geometrical　configuration　during　the　motion.　Although　the　model　presented　in　this　paper　is　derived　for　a　specific　configuration　of　the　body,　such　model　can　be　easily　generalized　to　describe　similar　non-structural　elements.　The　improvement　of　the　behaviour　of　the　body　due　to　its　ability　to　deform　is　assessed　with　an　extensive　parametric　analysis　that　is　performed　considering　both　one-sine　pulse　and　seismic　excitation.　The　results　show　that　the　deformation　of　the　assembly　that　occurs　before　and　after　the　start　of　the　rocking　motion　improves　the　performances　of　the　body.