The Siemens 3RK1911-0AH60 is an ECOFAST power bus cable, 5 x 6 sqmm, supplied as a 20m length and sold by the meter. It's the cable that runs between the power supply and the distribution blocks in an ECOFAST system — think of it as the backbone that carries 24 VDC and fieldbus signals out to the I/O modules and actuators on a machine or conveyor line.
This cable uses the ECOFAST connector system — a 5-pin, 6 mm² cross-section that handles the current for multiple I/O nodes. The 20m length is enough to reach from the power supply cabinet to a remote junction box or the far end of a machine section. Sold by the meter means you order the exact run length you need; the cable comes on a reel and is cut to order.
The 5 x 6 sqmm construction means five conductors at 6 mm² each — typically two for 24 VDC power (positive and negative), two for the PROFIBUS or AS-Interface data pair, and one shield drain wire. The 6 mm² cross-section keeps voltage drop manageable over the full 20m run, even when feeding several I/O modules.