The 6SL3520-1XH64-0AA0 is the hardwired-I/O 4 kW G115D in FSB frame under the 1XH64 sub-code. At 20.4 A with an integrated cooling fan, it delivers the highest power available in the FSB frame through the simplest control interface — four digital inputs and an analog speed reference input.

The 4 kW threshold — fan on, control simple

The step from 3 kW to 4 kW in the FSB frame marks the transition from natural convection to forced-air cooling. The integrated fan draws approximately 510 mA at 24 V DC — roughly double the consumption of the fanless 3 kW variant — and introduces a moving part to the drive's bill of materials. For installations where this maintenance trade-off is acceptable and the mechanical load genuinely requires 4 kW, the AA0 hardwired-I/O variant keeps the control architecture as simple as possible: run/stop and speed reference over discrete wiring, no fieldbus configuration, no network hardware.

1XH64 AA0 — the brownfield 4 kW choice

For a conveyor system upgrade where the existing multi-core control cable already runs alongside the motor leads, this drive connects to the same wiring infrastructure without pulling new Ethernet cable or adding network switch ports. The 1XH64 sub-code identifies this hardware revision; the electrical specification, mounting dimensions (425 × 240 × 169 mm), and terminal layout are shared across all 4 kW FSB sub-codes.