Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EFDC21104 found under Circuit Breaker Box by Crouse Hinds Electro. The National Stock Number assigned to this part is 5925010786529, 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 EFDC21104.