Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CTR-533 WITH SWT-529 found under Relay Electromagnet by Trane Co. The National Stock Number assigned to this part is 5945009019557, 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 CTR-533 WITH SWT-529.