Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HFXD63B100 found under Circuit Breaker by Siemens Energy And Automation Inc. The National Stock Number assigned to this part is 5925016661286, 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 HFXD63B100.