The SINAMICS G115D 6SL3520-2XA24-0AF0 is a 4 kW wall-mounted distributed drive in the FSB frame, configured with PROFINET and PROFIsafe communication via the AF0 suffix. This is the first fan-cooled variant in the G115D FSB range — the 4 kW power level introduces an integrated fan, extending the frame depth from 134 mm to 169 mm to accommodate the cooling assembly. It is designed for SIMATIC-controlled horizontal conveyor systems where safe torque off over PROFIsafe eliminates dedicated safety wiring.

What changes at the 4 kW power level?

The 4 kW variant marks the cooling boundary in the G115D FSB frame. Models at 3 kW and below use natural convection cooling with a 134 mm deep enclosure; at 4 kW, an integrated fan increases the depth to 169 mm while maintaining the same 425 × 180 mm frontal footprint. For conveyor installations where depth clearance is limited, the 3 kW fanless variant may be the better fit if the power requirement allows. The fan enables sustained operation at the higher 10.2 A HO rated current without derating.

What does the AF0 suffix provide?

The AF0 suffix upgrades the I/O from basic digital/analog (AA0) to PROFINET industrial Ethernet with integrated PROFIsafe. PROFINET enables real-time drive control and diagnostics from a SIMATIC PLC over a single network cable, while PROFIsafe delivers functional safety up to SIL 3 — safe torque off, safe stop, and safe speed monitoring — without separate hardwired safety circuits. For conveyor sections controlled by a SIMATIC PLC, the AF0 variant reduces both commissioning time and field wiring.