The Siemens 6SL3520-0XE42-2AF0 is the AS-Interface variant at the G115D platform's transition point from FSA to FSB — 2.2 kW with 5.9 A rated from the fanless FSB frame (425×180×134 mm). This is the XE42 catalog designation within the SINAMICS G115D series, parallel to XH22, XN02, 1XA02, and 1XA22. It represents the entry point to the larger FSB enclosure and the first power tier beyond the FSA 1.5 kW ceiling.

What changes when stepping from FSA to FSB fanless at 2.2 kW?

Three things. First, the frame grows: FSB is 425 mm tall (vs. 380 mm FSA), 180 mm wide (vs. 156 mm), and 134 mm deep — roughly 40% more enclosure volume for passive heat dissipation. Second, weight increases from approximately 4.5 kg (FSA) to 7.12 kg (FSB fanless), reflecting the larger die-cast housing and higher-rated output stage. Third, the rated current jumps from 4.1 A (FSA 1.5 kW ceiling) to 5.9 A — a 44% increase that opens up substantially longer conveyor belt sections and higher-throughput accumulation zones. The 2.2 kW FSB fanless drive is the workhorse of mid-range conveyor systems: enough power for most belt sections in automotive assembly and logistics sortation, still fanless for maintenance-free operation in dusty or fiber-contaminated environments.

AS-Interface on the XE42-2AF0 keeps the fieldbus wiring model consistent with the rest of an AS-i-standardized conveyor line. The drive taps into the yellow two-wire flat cable via insulation displacement — no Ethernet switch port consumed, no IP65 RJ45 gland to specify and stock. For a logistics center with 100+ distributed drives, the cumulative cost difference between AS-i and switched Ethernet infrastructure is substantial, and it is highest at the 2.2 kW tier where drive density peaks in typical conveyor layouts.