The 6SL3520-1XH63-0AA0 is the hardwired-I/O variant of the 3 kW G115D FSB drive under the 1XH63 sub-code. At 15.4 A with natural convection cooling, it occupies the distinctive position in the G115D lineup: the highest-power drive in the entire series that requires no cooling fan. The adjacent 4 kW FSB adds an integrated fan and nearly doubles the 24 V DC consumption.

The fanless ceiling — 3 kW is the decision point

For the conveyor system designer, the 3 kW FSB represents a genuine engineering choice. Every G115D from 0.37 kW through 3 kW is fanless — zero cooling maintenance, silent operation, ~250 mA at 24 V DC. The step to 4 kW adds a fan, a filter, a moving part with a finite bearing life, and ~510 mA of auxiliary current. If the application's mechanical load can be met at or below 3 kW, this drive eliminates fan-related service from the conveyor section's maintenance schedule for the life of the installation.

1XH63 with hardwired I/O — simple control at the fanless limit

The 1XH63 sub-code identifies this hardware revision of the 3 kW FSB platform. Paired with AA0 hardwired I/O — four digital inputs, one analog input for speed reference — the control architecture is as straightforward as the cooling method. A run command and a 0–10 V speed signal over discrete wiring are all this drive needs. For brownfield installations where the cable tray already carries multi-core signal cables alongside motor leads, this variant connects to the existing infrastructure without adding network hardware.