The Siemens 3RT2016-2BG42-0CC0 is a size S00 SIRIUS contactor rated for AC-3 motor duty at 4 kW on a 400 V three-phase line. The 1 NC auxiliary contact is built in, and the coil pulls in on 125 V DC. Spring-loaded terminals on the power and control sides speed panel wiring — no torque driver needed for the connection points.
What the AC-3 rating means for your motor load
At 4 kW / 400 V, this contactor handles a motor full-load current in the 8-9 A range. The DC coil (125 V) eliminates the inrush transformer and runs cooler than an AC coil on the same voltage; verify your control supply is DC, not rectified AC, because the hold characteristic differs.