The Siemens SIRIUS 3RT1036-1XX10-0UA8 is a size S2 power contactor rated for AC-2 duty at 22 kW on a 400 V line — that means it handles slip-ring motor starting and reversing, where the contactor makes and breaks under load each cycle.
AC-2 at 400 V (22 kW) is the motor-switching rating that governs real-world use for wound-rotor motors; AC-4 at 400 V (41 A) covers plugging and inching duty where the contactor opens at locked-rotor current. The 500 V rating of 30 kW and 690 V rating of 11.4 kW give headroom for higher-voltage installations. Switching frequency tops out at 1000 cycles per hour for AC-1 resistive loads, dropping to 300 cycles per hour for the punishing AC-4 regime — plan your cycle rate against the duty.
Screw terminals accept solid conductors 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²); stranded main conductors go up to 2x (0.75 to 25 mm²).