Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T11-12B found under Arrester Electrical Surge by Tii Industries. The National Stock Number assigned to this part is 5920012115557, 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 T11-12B.