Abstract: Assembling unit for use inside housings of luminous signallers arranged in airport areas, comprising an electronic board (1) and at least an electronic or electro-mechanical switching component (4), which is connected to the electronic board (1) by means of electric connecting cables (10), which are flexible for damping mechanical vibrations directed towards the electronic switching component (4) in order to avoid the occurring of undesired switching. According to an aspect of the invention, the switching component (4) can comprise outside a protective material absorbing the impacts or a protective cap (5) or it can be immersed in a liquid which damps its oscillations originating as a consequence of the mechanical vibrations which reach the switching component (4) itself.