The ABB 1SFL577001R6911 is an electrical contactor from the Contactors and Starters category, delivered with pre-mounted auxiliary contacts already fitted. That means the auxiliary block is integrated at the factory — one less assembly step during panel build, and the contact arrangement is fixed as delivered, not field-configurable.
Integration Note
The pre-mounted auxiliary contacts save panel-wiring time: the auxiliary block is already aligned and torqued, so there is no risk of losing the tiny screws or mis-seating the spring clips during assembly. For a panel OEM wiring a row of these contactors, that is one less quality-check item per unit.