What it is and what it does
The Siemens 3RK1911-0CQ30 is an ECOFAST power cable interface — a preassembled cable segment with HAN Q8 connectors on both ends, wired 5 x 2.5 sqmm. It's the drop between the control cabinet and a remote device like a motor or sensor junction box in the ECOFAST modular wiring system. Length is specified between 3 m and 5 m, ordered in a minimum 10 cm grid.
Integration note
The HAN Q8 connector is a rectangular industrial interface rated for power and signal in the ECOFAST system. The 5 x 2.5 sqmm conductor cross-section handles typical motor or actuator supply currents in a 24 VDC or low-voltage AC control circuit. When ordering, specify the exact cable length in 10 cm steps within the 3–5 m range; the assembly comes pre-terminated and tested from Siemens.