The Siemens 3RT1016-2AF01-ZW98 is a 3-pole size S00 contactor rated for AC-3 motor duty at 4 kW at 400 V, with a 110 V AC 50/60 Hz coil and a single normally-open auxiliary contact. The multiunit packing (20 pieces per carton) matches the consumption rate of a panel shop or a planned line changeout.
The AC-3 rating at 4 kW / 400 V means this contactor is sized for switching squirrel-cage induction motors — making and breaking the load current during starting and stopping. AC-3 is the standard duty category for motor contactors; the 4 kW figure at 400 V three-phase covers a typical small pump, fan, or conveyor motor. The 110 V AC coil pulls in reliably across the 50/60 Hz range, so it works on either mains frequency without a coil change.
The cage-clamp connection handles 0.2–2.5 mm² conductors; strip length is 8 mm. The single NO auxiliary contact is built in — no add-on block needed for a basic feedback signal. The 110 V AC coil draws roughly 4.5 VA inrush and 2.5 VA hold; verify the control transformer sizing if multiple contactors pull in simultaneously.