Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B20TR-111 found under Battery Power Source by Universal Power Systems Inc. The National Stock Number assigned to this part is 6130015292994, and the Federal Supply Class is 6130 Converters Electrical Non Rotating. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B20TR-111.