Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4RD 003 520 157 found under Relay Electromagnetic by K G Knutsson Handles Ab. The National Stock Number assigned to this part is 5945145199018, 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 4RD 003 520 157.