Ratings and fit for motor switching
The Siemens 3RT2023-1AG20-Z X95 is a size S0 power contactor rated AC-3e/AC-3 at 9 A, which translates to 4 kW switching capacity on a 400 V three-phase motor. The three main poles handle the motor load; the integrated 1 NO + 1 NC auxiliary contacts give you one feedback signal and one interlock without adding a side-mount block.
Size S0 footprint — 85 x 45 x 100 mm packaged dimensions — mounts on standard DIN rail. The 110 V AC coil draws its rated inrush and hold current from the control transformer; verify the transformer VA budget if you are ganging several contactors on one circuit.