The Siemens 6SL3520-0XE03-0AF0 is the AS-Interface variant at 3 kW in the SINAMICS G115D distributed drive family, carrying the XE03 catalog designation — a newly discovered code that extends the XE0x sub-series downward from its previously known 4–7.5 kW range to 3 kW. At 7.7 A rated and 15.4 A overload in the fanless FSB frame (425×180×134 mm, 7.12 kg), this is the highest-power fanless G115D rating — the ceiling of natural-convection cooling before the 4 kW transition to integrated fan cooling.

What is XE03 and how does it relate to XE43?

XE03 is the XE0x sub-series code for 3 kW FSB fanless — parallel to XE43 in the XE4x sub-series. Both identify the same hardware: the same 425×180×134 mm fanless FSB enclosure, same 7.7 A rated / 15.4 A overload output, same natural convection cooling. The same hardware is also available as XH23, XN03, XM03 (0XH series), 1XA03 (1XA0x sub-series), and 1XA23 (1XA2x sub-series) — seven parallel catalog codes for the identical 3 kW fanless FSB drive. The XE03 designation simply adds the XE0x sub-series to this already well-served power rating.

Why 3 kW is the fanless ceiling

At 7.7 A rated, the 3 kW FSB power stage dissipates approximately 120–150 W of heat — the maximum the 425×180×134 mm IP65 enclosure can shed through natural convection at 40°C ambient. Beyond 3 kW, the heat load exceeds what passive cooling can manage, and Siemens transitions to the fan-cooled FSB frame (+35 mm depth, integrated 24 V DC fan) at 4 kW. This makes the 3 kW fanless FSB a distinct design point: it delivers the highest G115D power without the auxiliary 24 V current draw (~250–290 mA for the fan) and without the moving-part reliability consideration of a fan. For conveyor sections in dusty or high-vibration environments where fan longevity is a concern, the 3 kW fanless FSB is the highest-power option that eliminates the fan entirely.

XE0x sub-series: now 3–7.5 kW

With XE03 joining XE04 (4 kW), XE05 (5.5 kW), and XE07 (7.5 kW), the XE0x sub-series now covers 3–7.5 kW across FSB fanless, FSB fan-cooled, and FSC frames. Lower-power XE0x codes at 0.37–2.2 kW (FSA and fanless FSB at 2.2 kW) are structurally expected but not yet observed. The XE0x sub-series currently carries all three communication variants across its confirmed range — AA0, AF0, and AB0 — with the exception of XE03 where only AF0 is confirmed in this batch.