What the part is on the BOM line
The ABB 1SAZ741201R1040 is a solid state overload relay under Circuit Breakers, Fuses & Protection › Relays › Solid State Overload Relays. It is the line-side current-sensing device that pairs with a contactor to give a motor starter its overload trip characteristic — the SSR module handles the current measurement and trip decision, the contactor carries the breaking duty.
Why a 7.6 A class matters in panel layout
The model designation carries a numeric suffix that sets the current range window the relay is calibrated to protect, and a letter suffix indicates the trip class. For procurement the relay is sized for small-horsepower motor circuits, and the matching contactor frame is dictated by that current window, not by the relay itself.