Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ETN4370 found under Tripper Circuit Breaker by Spd Electrical Systems Inc. The National Stock Number assigned to this part is 5925002481447, 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 ETN4370.