Where it lives in a panel
The 1SAZ811201R1003: A SSOLR of this class sits downstream of the contactor on a motor branch — it measures phase current through internal CTs, models the motor's heating curve in firmware, and trips the contactor's coil via the NC contact when the model crosses the trip threshold. That makes it the thermal-trip element in an across-the-line starter, paired with a short-circuit protective device (a manual motor protector or breaker) ahead of it for the bolted-fault zone, which is where the selectivity and SCCR coordination work is done at the panel level.