What it is and what it does
The Siemens 3RK1911-0CR30 is an ECOFAST power cable interface for the ET 200X distributed I/O system. It comes preassembled with a 5 x 4 sqmm cable and HAN Q8 connectors crimped on both ends, in a length greater than 3 m but less than 5 m. When ordering, you specify the exact length in 10 cm increments.
Where it goes
The 3RK1911-0CR30 is purpose-built for the ET 200X family of remote I/O stations. The HAN Q8 connector on both sides means it plugs directly into the power feed module on the I/O station and the mating connector on the machine-side cable, so there is no field wiring or gland plate work on this segment. The 5 x 4 sqmm cross-section handles the power supply for the I/O station and any downstream actuators.