Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Y991220A-78736-1 found under Cabinet Electrical by Siemens Energy And Automation Inc. The National Stock Number assigned to this part is 5975015060454, and the Federal Supply Class is 5975 Electrical Hardware And Supplies. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like Y991220A-78736-1.