What it is
The ABB 1SBL181022R8510 sits in the Electrical Contactors family under Contactors and Starters, listed at a 3 A rating on the line. As a contactor in this class it carries switching duty for small motor or resistive loads inside a control panel — coil-controlled, mechanically latched contacts wired into a starter string.
Sourcing reality
The order code 1SBL181022R8510 is the line item to specify into the BOM; cross-reference it against the PO so nameplate and purchase document trace to the same string before release.