The ABB CAL18-11B is an industrial-grade, heavy-duty limit switch belonging to ABB's extensive CAL (Component Automation) series. The "-11B" suffix denotes a specific variant featuring a built-in "B" type metal operating lever with a side rotary roller actuator. It is a robust, mechanically actuated precision switch designed to reliably detect the position or end-of-travel of moving parts in industrial machinery, converting mechanical motion into a definitive electrical control signal.