The ABB 1SBL161001R8001 is an electrical contactor from the ASEA BROWN BOVERI catalogue, sitting under the Contactors and Starters branch of the Circuit Breakers, Fuses & Protection tree. It is the line-item a procurement desk lands on when the BOM calls for an ABB contactor under that exact order code.
Electrical contactors in this family are the switching element on the line side of a motor starter or lighting/heater bank — the coil pulls in to close the power poles and the auxiliary block carries the control-side feedback. Mounted on DIN rail inside a control panel, the contactor sits between the protective device upstream and the load downstream, so the upstream breaker or fuse coordinates with its rated making/breaking capacity.