Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EF400 found under Contactor Electrica by E C C Spares And Services Electro Work. The National Stock Number assigned to this part is 5945001838581, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EF400.