Where the class lives in a panel
The 1SAM250000R1002: Parts at this level of the ABB catalog are the accessories that wrap a motor starter — terminal shrouds, coil suppression kits, mechanical interlocks, busbar links, auxiliaries and the like — installed alongside the contactor or starter rather than on the power conductors themselves. Specified into the BOM for greenfield MCC builds and for retrofit panels, the accessory goes in the same gear-row as the host device so the wiring diagrams and the control schematic stay one-to-one at the install window.