The Siemens 6SL3520-0XB44-0AF0 is the PROFINET/EtherNet/IP communication variant in the 0XB connector system of the SINAMICS G115D wall-mounted distributed drive family, rated at 4 kW in the FSB fan-cooled frame (425 × 180 × 169 mm, 7.52 kg). With 10.2 A rated output (High Overload), 380–480 V 3-phase supply, B-connector, and integrated PROFIsafe SIL 2 safety, it marks the first confirmation of 0XB at the FSB power class — extending the 0XB system beyond the initially observed FSC range (5.5–7.5 kW) into the highest FSB power rating.

What does 0XB at FSB mean?

The 0XB code system is now confirmed at both FSB (4 kW via 0XB44) and FSC (5.5–7.5 kW via 0XB45/47). With 0XB42 (2.2 kW) and 0XB43 (3 kW) also in this batch, 0XB spans 2.2–7.5 kW FSB+FSC — a substantial range for a newly discovered catalog path. Electrically and mechanically identical to the corresponding 1XB variants at the same power. The 0XB44-0AF0 is the 4 kW PROFINET option in the 0XB catalog path.

What motor types are supported?

The drive delivers 10.2 A rated output current with 200% overload — 20.4 A for 3 seconds. Supports IE3 asynchronous motors, IE4 synchronous reluctance motors, and SIMOGEAR geared motor combinations up to 4 kW. Control modes: V/f (0–550 Hz), V/f with FCC, sensorless vector control (0–240 Hz). Integrated 180 V DC brake control. 2-port PROFINET switch. The integrated fan adds 35 mm depth vs fanless FSB.

Frequently Asked Questions

Is an external braking resistor required?

At 4 kW, an external braking resistor (minimum 130 Ω for FSB) is recommended for decline conveyors, high-inertia loads, and frequent emergency stops.