Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A645-3551-1 found under Transformer Current by Essex Electro Engineers Inc. The National Stock Number assigned to this part is 5950010581337, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A645-3551-1.