The ABB 1SAZ721201R1008 is a solid state overload relay in the Circuit Breakers, Fuses & Protection › Relays › Solid State Overload Relays class — the kind of device you wire in alongside a contactor to give a motor branch electronic, adjustable overcurrent protection instead of a thermal bimetallic strip. Class placement matters here: it tells you this sits in the same protection family the buyer already has on the BOM, not a breaker or a fuse block.
Solid state overload relays in this class typically take their sensing current from the motor feed (often through integral CTs) and switch a dry contact that drops the contactor coil — so the panel-side wiring stays simple: line through the device, control output back to the contactor coil, and the set current dialed to the motor's full-load amps. The specific current range, trip class, and auxiliary contact arrangement for the 1SAZ721201R1008 belong on the ABB datasheet; what the listing confirms is the device identity and class, so the rest of the BOM line can lock around it without ambiguity.