The Siemens SIRIUS 3RT1026-3AP06-ZW95 is a size S0 power contactor with three normally-open main contacts, screw-type terminals for the main current circuit, and a rated operational voltage of 230 V at 50 Hz.
The AC-2 rating at 400 V is 11 kW, which covers the majority of slip-ring motor applications up to that power — the duty class that governs real motor switching, not just resistive loads. The AC-4 rating at 400 V is 15.5 A, so it handles reversing and inching duty for motors within that current envelope. For type 1 coordination, the maximum fuse is gL/gG 100 A; for type 2 coordination, it drops to 35 A — this tells the panel builder what upstream protection keeps the contactor serviceable after a fault.
The S0 frame size keeps the footprint compact: 65 mm wide, 85 mm high, 91 mm deep. Wire range for main contacts accepts 2x (0.25 to 2.5 mm²) solid, 2x (1 to 2.5 mm²) stranded, and up to 2x 10 mm² or 1x 8 AWG.