The 6SL3520-1XH23-0AA0 occupies a unique position in the G115D lineup: at 3 kW and 15.4 A, it is the highest-power G115D cooled entirely by natural convection. The adjacent 4 kW FSB variant requires an integrated fan drawing approximately 510 mA from the 24 V DC rail. This 3 kW unit draws roughly half that — about 250 mA — and runs silently with no moving parts in the cooling system.

The fanless ceiling — why 3 kW matters

For conveyor system designers, the 3 kW FSB represents a genuine decision point. Below it, every G115D from 0.37 kW upward is fanless — zero cooling maintenance, silent operation. Above it, every G115D (4 kW through 7.5 kW) requires a fan. If the application's mechanical load peaks at 3 kW, choosing this variant avoids introducing fan maintenance into the service schedule. The 425 mm FSB housing, wall-mounted with IP65/IP66 protection, handles washdown environments without the concern of a fan bearing or filter degrading over time.

Hardwired I/O at the fanless limit

The AA0 hardwired interface — four digital inputs, one analog input — keeps the control architecture as simple as the cooling. A run command and a 0–10 V speed reference over discrete wiring are all this drive needs to run a conveyor section. For brownfield upgrades where the existing control cabinet already routes multi-core signal cables alongside motor leads, this variant plugs into the same wiring infrastructure without adding a network switch port or pulling new Ethernet cable.