The 6SL3520-0XB03-0AA0 is a landmark G115D discovery — 0XB03 is the first 0XB0x sub-series code below 4 kW, extending the "0X" prefix B-connector 0XB0x path into FSB fanless territory at 3 kW. Previously the 0XB0x sub-series was only confirmed at 4–7.5 kW (0XB04/0XB05/0XB07, all fan-cooled FSB or FSC). 0XB03 at 3 kW FSB fanless (425 × 180 × 134 mm, 7.12 kg, natural convection) fills the first of the missing lower-power 0XB0x codes — and arrives with all three communication variants (AA0/AF0/AB0) confirmed in this batch. It delivers 7.7 A HO (15.4 A LO), designated for SIMATIC control systems, operating at 380–480 V three-phase with B-connector interface. Compatible with IE2/IE3/IE4 motors across 0–550 Hz, IP65 sealed.

0XB03 vs 0XB43 — the two 0XB paths to 3 kW FSB fanless

At 3 kW FSB fanless, 0XB now has two parallel catalog codes: 0XB03 (0XB0x sub-series) and 0XB43 (0XB4x sub-series, structurally expected). Both identify the same 3 kW FSB fanless B-connector hardware — 7.7 A HO, 425 × 180 × 134 mm, 7.12 kg, natural convection. The "03" vs "43" distinction in PN positions 7-8 is the sub-series identifier — 0XB0x vs 0XB4x — exactly as 0XB04/0XB44 coexist at 4 kW and 0XB05/0XB45 at 5.5 kW. This same-hardware, dual-catalog-code pattern is consistent across the entire 0XB family. For the engineer, either code orders the same physical drive.

0XB0x sub-series — now confirmed from 3 kW upward

Only 0XB00–0XB02 (FSA 0.37–1.5 kW) remain unobserved in the 0XB0x sub-series. With 0XB03 now confirmed, the 0XB0x path is one step away from spanning the full G115D power range.