The Siemens 3RT2018-2BB42-Z W97 is a 3-pole power contactor in the SIRIUS series, frame size S00. Its AC-3e/AC-3 rating of 16 A and 7.5 kW at 400 V means it is sized for switching three-phase induction motors up to that load — the AC-3 category covers starting and stopping squirrel-cage motors under full load, which is the standard duty for general-purpose motor control. The 24 V DC coil is a common control voltage in PLC-driven panels; the 1 NC auxiliary contact provides a feedback signal for the safety circuit or status indication without needing a separate add-on block.
The S00 frame footprint is compact for a 16 A contactor; on a DIN rail, it leaves room alongside overload relays and terminal blocks for a dense layout. The multi-unit packaging (32 units per pack) is a bulk-buy option for OEMs building multiple panels, not a single-piece retail box.
RoHS compliance dates from October 1, 2009, so it meets the EU substance restrictions for new installations. No UL or CSA listing appears in the record; verify with the full datasheet if the project requires a specific agency mark.