Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9990-9H38 found under Circuit Breaker by Union Carbide Corp. The National Stock Number assigned to this part is 5925009057223, and the Federal Supply Class is 5925 Circuit Breakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9990-9H38.