Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RBEJ40AD55-4 found under Lead Electrical by R And B Electronics Inc. The National Stock Number assigned to this part is 6150013410582, and the Federal Supply Class is 6150 Miscellaneous Electric Power And Distribution Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RBEJ40AD55-4.