What it is and where it lands
The Siemens 3RK1911-0CS20 is an ECOFAST power cable interface for the ET 200X family, with 5 x 2.5 sqmm conductors and preassembled HAN Q8 connectors on both sides. Length is ordered in 10 cm increments, under 3 m.
What the description tells the wireman
The cable has HAN Q8 connectors on both ends, factory-terminated. The 5 x 2.5 sqmm conductor count matches the ET 200X power bus. Length is ordered in 10 cm steps, under 3 m.