The Siemens 3RT1015-1HB42-ZI41 is a 3-pole contactor in the SIRIUS series, Size S00, with screw terminals. The DC 24V coil has a control voltage tolerance of 0.7 to 1.25 times the rated supply voltage, so it holds in reliably down to about 16.8 V and picks up cleanly at the nominal 24 V. The single NC auxiliary contact is built in, no add-on block needed for basic feedback or interlock.
Panel builders should allow the manufacturer's recommended clearance for arc quenching — typically 10 mm laterally and 50 mm above/below for a contactor this size — though the exact spacing depends on the enclosure and adjacent devices.
Because the lifecycle stage is current, this contactor is a standard BOM line item — no special sourcing required. For a line-down replacement or a new panel build, the 3RT1015-1HB42-ZI41 is quoted to order through normal supply. The AC-3 rating at 400 V is the motor-switching figure that governs real use; a 3 kW motor at 400 V draws roughly 6.5 A full-load, well within the contactor's capability.