Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3503311-03 found under Power Supply by Sie Computing Solutions Inc. The National Stock Number assigned to this part is 6130014961718, and the Federal Supply Class is 6130 Converters Electrical Non Rotating. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3503311-03.