Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 401 03.5 found under Fuse Indicator Alar by Littelfuse Inc. The National Stock Number assigned to this part is 5920010567256, and the Federal Supply Class is 5920 Fuses Arresters Absorbers And Protector. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 401 03.5.