At 4 kW (10.2 A rated, 20.4 A overload), the 6SL3520-1XE44-0AF0 sits at the fan-cooled threshold of the FSB frame. The 1XE designation adds an integrated Category C2 RFI filter to the gland-type entry — important at 4 kW where the power-stage switching harmonics are stronger than at the 2.2–3 kW level.

Why does the C2 filter matter more at 4 kW?

As drive power increases, the conducted emissions from the output stage rise proportionally. At 4 kW, the 172.9 W power loss translates to higher switching-energy harmonics on the input line. The integrated C2 filter ensures EN 61800-3 Category C2 compliance for industrial environments without an external filter module — keeping the wall-mounted footprint self-contained and the BOM count at one part number. The fan-cooled FSB envelope (425 × 180 × 169 mm) with cable gland entry maintains the full IP66 compression seal — a practical advantage when the 4 kW drive sits on a conveyor frame exposed to cleaning routines or outdoor humidity.

Key specifications

The drive operates from a 3 AC 380–480 V supply (45–66 Hz) with an output frequency range of 0–550 Hz. High-overload capability delivers 200% for 3 seconds and 150% for 57 seconds. Integrated PROFINET and Ethernet IP interfaces connect directly to SIMATIC controllers. The built-in C2 RFI filter meets EN 61800-3 Category C2 conducted emission limits for industrial environments.