What it is
The ABB 1SAM150000R1003 is catalogued as a 4 A manual motor starter accessory within the ABB contactor and starter accessories range, intended to mount with the matching manual motor starter frame as a supplementary component rather than a standalone switching device.
Where it sits in the panel
Manual motor starter accessories of this class are used to extend the base MS starter — for shunt trips, auxiliary contacts, undervoltage releases or rotary door-handle kits — so that one starter assembly can carry the full motor branch: short-circuit and thermal protection on the device itself, plus the signalling and remote-trip hardware mounted alongside it.