Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R5C4201A21A10 found under Relay Electromagnet by Jennings Technology Company Llc. The National Stock Number assigned to this part is 5945008929835, 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 R5C4201A21A10.