Rack DIN-3 4U Q-Fiber designed for installation in a data communication cabinet by means of rack bolts. It has been designed to hold passive elements (up to 13 industrial switches MINI ODF-DIN or ODF-DIN, etc.), active elements equipped in mounting holders for the DIN-3 rail (media converters, switches, fibre-optic extenders, etc.). Such solution facilitates very quick installation and dismantling elements, without the need to use additional tools.