Core Ratings and Application
The Siemens 3RT2023-1AL20-Z W97 is a size S0 power contactor from the SIRIUS family, rated AC-3e/AC-3 at 9 A with a 4 kW switching capacity at 400 V. The AC-3e rating is the relevant figure for controlling standard three-phase squirrel-cage motors — it defines the contactor's ability to make and break locked-rotor current during starting and running. The 9 A rating means it directly switches a motor drawing up to 9 A in full-load current; for a 400 V supply, that translates to the 4 kW motor capacity. The 230 V AC coil, 50/60 Hz, is a standard control voltage across European and many Asian panel designs. Screw terminals are used for both main and auxiliary connections — expect to torque to the manufacturer's specification for the wire range; spring-cage variants are also available in the 3RT2 series if vibration resistance is a priority.
Integration Notes
It occupies roughly 45 mm of rail width (the 90 x 50 x 105 mm packaging dimensions give the envelope). The 230 V AC coil draws its control power from a standard phase-to-neutral or phase-to-phase supply — no DC link or rectifier needed. If you are integrating into a 24 V DC control system, look for the 3RT2023-1AL20-Z W97's DC coil variant (order code suffix changes).