The 6SL3520-1XE00-3AA0 is the I/O Control variant at the lowest 1XE00 power — 0.37 kW FSA, the smallest drive in the new 1XE series. It delivers 1.3 A HO (2.6 A LO) in the FSA compact frame (380 × 156 × 129 mm, ~4.7 kg) with natural convection cooling, designated for SIMATIC control systems. AA0 provides basic terminal control — start/stop, direction, and analog speed reference without a fieldbus. Operates at 380–480 V three-phase, compatible with IE2/IE3/IE4 motors across 0–550 Hz, IP65 sealed. This is the lowest-cost entry point to the 1XE catalog path.