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Export restricted (ITAR), sale only to US Citizens and Organizations. Electrical Power System Unit created for the Spacehab service module by the McDonnell Douglas Space Systems Company (MDSSC), 19˝ x 12˝ x 9˝ (21 pounds), with parts label to the reverse reading: “Part No. 9063103-1 REV E, Serial No. SN004, Cage Code 56057, Spec No. N/A.” Essentially, the Spacehab electrical ‘control center,’ the EPSU allowed Space Shuttle astronauts to turn on/off the main and subsystem power, manage power to experiments and workstations (both AC and DC), override circuits in emergencies, test critical systems like environmental control, and monitor or interface with fire detection/safety systems. The front panel features several accident-preventing safety bars, under which are knobs and switches related to sections like ‘EXP DC,’ ‘EXP AC,’ ‘Override,’ ‘WPP DC,’ ‘WPP AC,’ ‘Main DC,’ and ‘Main AC.’ The lower portion also features an area for ‘Fire Hole’ and ‘ECS Test.’ The upper and lower sections of the EPSU’s frame bear a total of 14 connection ports, all of which are capped and marked in black felt tip. Includes its original yellow-bordered ‘Material Acceptance Tag’ dated March 26, 1996, which reads: “Item Name EPSU Box,” “Part No. 9063103-1,” “REV D,” “Qty Acc. 1,” “Serial/Lot # 004,” and “CCN VC…95360.” The tag identifies the EPSU as a flight item, and the upper portion bears an affixed label marked “BS-T-03-01.”
