The Siemens SIRIUS 3RT6016-1KF41 is a size S00 coupling contactor with a 110 V rated coil, designed for screw-and-snap-on mounting onto 35 mm standard mounting rail per DIN EN 50022.
The AC-3e rating of 6.7 A at 690 V defines its motor-switching capacity — this is the figure that governs real-world induction motor duty, not the higher resistive AC-1 numbers. At 400 V and 60 °C ambient, it handles motor loads up to 13 kW; at 690 V and 60 °C, up to 22 kW. The 110 V coil draws 1 A at rated voltage, with a 6 A inrush at 24 V and 10 A at 230 V — watch the control transformer sizing if you're sharing the 110 V bus with other contactors. Mechanical life is rated at 30,000,000 operations typical, with maximum switching frequencies of 750 1/h under AC-3 duty and 250 1/h under AC-4 (plugging/reversing).
Conductor cross-sections range from 2x 0.5 mm² up to 2x 4 mm² (solid or stranded), with AWG equivalents of 2x 12 for the main contacts.