Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 399542-B21 found under Power Supply by Hewlett Packard Australia Ltd. The National Stock Number assigned to this part is 6120015485869, and the Federal Supply Class is 6120 Transformers Distribution And Power Station. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 399542-B21.