Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IR3120IB found under Light Warning by Whelen Engineering Company Inc. The National Stock Number assigned to this part is 6210011869782, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like IR3120IB.