500 Series Racks and Modules: The 500 Series Format has exploded over the past 8 years.  The 500 series design itself has been around for a while but in the past 8 years many manufactures have stepped up their game in this format.  A lot of manufactures are not only making modules but also are making 500 series rack systems to house the modules.  In this section you will find 500 Series Racks, Modules and accessories.