The LS21M42B11-U01 is a limit switch featuring a 30mm mini steel roller lever actuator designed for industrial automation and control systems. This switch is manufactured by Thomas & Betts, a member of the ABB Group, and is built with a steel roller lever mechanism that provides reliable mechanical actuation. The product weighs 0.53 lbs per unit and carries the Harmonized Code 8536509055, indicating its classification as an electrical switch component. Limit switches of this type are commonly used in machinery, conveyor systems, and industrial equipment to detect position, control motion, and provide safety interlocks in automated processes.