ATCOMPACT protection box is a multi-pole power supply protection box which is used mainly as protective fuse for protection of all lines emerging from single-phase SPD . Made from several kinds of SPD, it includes the protective fuses used against short circuits and installed in parallel combination with the supply line. Its way of working should not be altered at all if there are normal conditions. The combinations are generally made from protection which is either in the differtial mode (between line/s and neutral) or the common mode (ground referred), This compact box is quite easy to install and it has the same advantages that Aplicaciones Tecnológicas SPDs provide. Quick, robust, tested and reliable are these products according to the current standard (EN 61643-11) present in official independent laboratories.