What this cable assembly is
The Siemens 3RK1911-0CR41 is an ECOFAST subsegment cable assembly, 5 x 4 sqmm, with a length range of 5m to 10m. It comes preassembled at both ends: a HAN Q4/2 connector on the supply side and a HAN Q8 connector on the other. This is a factory-terminated, ready-to-run harness for ECOFAST distributed I/O and motor starter systems — no field wiring, no pinout guesswork.
This cable connects ECOFAST subsegment modules (like the 3RK1908 series) to the main ECOFAST trunk line. The 5 x 4 sqmm conductor cross-section handles the power and signal routing for up to four motor starters or I/O blocks on a subsegment. The HAN Q4/2 supply-side connector mates to the trunk tap, while the HAN Q8 end feeds the subsegment distributor — both are keyed and color-coded, so miswiring is mechanically blocked.