What this coupling contactor does that a standard power contactor cannot
The Siemens 3RT6016-1KF42 is a SIRIUS coupling contactor, Size S00 — a specialized switching device designed to isolate control signals between different voltage domains or safety circuits, not to switch motor loads directly. Its primary role is to pass a control signal from one circuit to another while maintaining galvanic isolation, making it the correct choice for interlocking, safety isolation, or signal routing in a panel where a standard power contactor would be oversized and misapplied. These ratings define the signal-level currents it can reliably make and break — not motor full-load amps. For motor switching, you would look at the 3RT6 power contactor line; this part is for the control circuit.