Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 303 170 3 found under Contact Kit Electrical by Automatic Switch Company. The National Stock Number assigned to this part is 5999014192101, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 303 170 3.