The Siemens 3RT2018-1AT62 is a 3-pole power contactor from the SIRIUS family, sized in the S00 frame. Its AC-3e rating of 16 A and 7.5 kW at 400 V defines the motor load it can switch — that's the figure that governs real-world duty on a pump, fan, or conveyor drive, not the thermal continuous current. The 600 V AC coil at 60 Hz matches North American control voltage standards.
Screw terminals accept 1.5 to 4 mm² stranded wire; the single NC auxiliary contact on the front can be used for feedback to a PLC input or safety circuit without an add-on block.