What it is and where it sits
The ABB 1SAM250000R1007 is filed as a contactor and starter accessory under the circuit-breaker protection line, sized in the 1.6/2.5 A range per the description carried in the catalog row. It belongs to the same MS-family accessory bucket as other ABB 1SAM-prefixed items — the sidecar hardware that hangs off a motor-starter breaker rather than the breaker itself.
Reading the rating for fit
The 1.6/2.5 A figure is the trip window listed for this part, so the matching upstream breaker should be set inside that band when reviewed against the motor's FLC.