The 6SL3520-1XK00-3AA0 is the entry point to the entire G115D 1XK wide-voltage range: 0.37 kW, 1.3 A rated output, hardwired I/O control, FSA frame. As the lowest-power, lowest-cost variant in the 1XK series, this drive serves the simplest decentralized motion tasks — a single roller, a small belt section, an auxiliary feed — where the engineering requirement is reliable speed control from a PLC analog output and the budget does not support network integration at every station. The 1/3-phase input flexibility is preserved all the way down to this entry variant: even the smallest drive on the machine can run from single-phase supply if the site wiring demands it.