What it is and where it lands in the panel
The ABB 1SAZ721201R1023 is a solid state overload relay in the 0.74–1.00 A current setting range, classed under Solid State Overload Relays. It pairs upstream with a contactor as the motor-side protection element, sized for fractional-horsepower three-phase loads in that 0.74–1.00 A band.
Ratings in plain terms
The 0.74–1.00 A setting is the number that drives the BOM line: the relay trips when sustained current sits above that window, so the motor nameplate FLA must fall inside it. Below the minimum, the relay will not develop enough heating element bias to protect the windings; above the maximum, nuisance tripping takes over before the motor reaches rated load.