Abstract: Disclosed herein is a modular enclosure apparatus for personal computers and/or work stations having a plurality of removable and replaceable modules. These modules include a cooling module for cooling the enclosure; a memory storage device module having a plurality of mating slides and carriers for routine installation and removal of each memory storage device; and a power supply module for providing power to the enclosure. In a RAID embodiment, the modular enclosure apparatus includes a RAID controller module which is similarly removable and replaceable. Each of the modules may include a circuit interrupt assembly for disabling individual modules (by cutting off power to the desired module) and allowing that module or parts contained therein to be removed while the power is disabled only to the module desired and the remaining modules continue to be enabled.