Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LB1LC03M53 found under Protector Thermal Overload Elect by Square D Co. The National Stock Number assigned to this part is 6110015472557, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like LB1LC03M53.