Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 500 0021 found under Relay Electromagnetic by Electro National Corporation. The National Stock Number assigned to this part is 5945004496723, 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 500 0021.