What this code is
The ABB 1SAM150000R1008 is a contactor and starter accessory carrying the 2.5–4 A current range from the ABB MS-series motor-starter family — not a breaker and not a complete contactor, but a piece that drops onto the existing starter build to set or extend a specific function within that current window.
Where the class belongs on the panel
Contactors and starter accessories in this family live on the same DIN rail as the main contactor and the overload relay — they wire into the control side, not the line side, so the panel builder keeps the power conductors undisturbed while the accessory picks up its tap from the coil or auxiliary circuit.