At 4 kW (10.2 A rated, 20.4 A overload), the 6SL3520-1XE44-0AB0 sits at the most thermally significant transition in the G115D FSB range — the switch from natural convection to forced-air cooling. The 1XE designation pairs gland-type cable entry with an integrated C2 RFI filter, making this the drive for 4 kW conveyor sections where both cooling capacity and environmental sealing are non-negotiable.

Why does the 4 kW cooling transition matter for conveyor applications?

Below 4 kW, the FSB frame dissipates up to 125.8 W of power loss through natural convection alone — no fan, no moving parts, no filter maintenance. At 4 kW, power loss rises to 172.9 W and the heatsink alone can no longer keep the power stage within its thermal envelope at +40 °C ambient. The integrated fan (510–550 mA at 24 V DC) extends the enclosure depth from 134 mm to 169 mm and keeps the drive running at full rated output continuously. For inclined conveyors or accumulation zones where the drive sees sustained near-full-load duty, the fan-cooled FSB is the correct thermal choice — the convection-cooled ratings assume intermittent duty or derated ambient conditions.

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. The 175 Ω integrated braking resistor (10 W continuous) supports dynamic braking. 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.