The 6SL3520-1XK04-0AF0 is the 4 kW, FSB-frame G115D — the highest-power variant in the FSB size before stepping up to the FSC frame. Rated for 10.2 A continuous output with 20.4 A peak (200% for 3 seconds), it handles the heaviest conveyor sections, transfers, and processing stations that still fit within the mid-size FSB form factor. The AF-suffix variant adds enhanced communication for SIMATIC-controlled distributed automation networks.

The 425 × 180 × 134 mm FSB enclosure mounts directly on the machine frame — no control cabinet required. IP65 protection with connectors (IP66 with cable glands) and UL Type 4X indoor rating suit washdown and dusty production environments. Standard G115D features include an integrated C2 EMC filter, internal braking resistor, STO SIL 2 via Profisafe, and SAM web-server commissioning. IE2/IE3 asynchronous and IE4 synchronous reluctance motors are supported with V/f or vector control from 0–550 Hz.