Motor switching contactor, AC-3 duty
The Siemens 3RT1035-1AR60-ZW96 is a contactor rated for AC-3 duty — the utilization category for starting and stopping squirrel-cage induction motors — at 18.5 kW on a 400 V three-phase supply. That rating governs the motor load it can handle: 18.5 kW at 400 V is the line-side figure you match against the motor nameplate power and voltage. For a 400 V line, this contactor fits a 18.5 kW motor load in AC-3 service.