The 6SL3520-0XM03-0AA0 is a 3 kW SINAMICS G115D distributed wall-mounted frequency converter in the FSB frame size. Positioned between the 2.2 kW FSB and the 4 kW FSB, it delivers 7.7 A of continuous output current for three-phase asynchronous and synchronous reluctance motors up to 3 kW. Like the 2.2 kW FSB, the 3 kW model uses natural-convection cooling — there is no integrated fan — making it a mechanically simple, low-noise drive suited to conveyor sections where fan filter maintenance would be impractical.

When does natural-convection cooling make more sense than a fan-cooled drive?

The 3 kW FSB relies on passive heat dissipation through its aluminum housing — the same cooling principle used across the FSA range and the 2.2 kW FSB. The primary trade-off is thermal versus mechanical: a fan-cooled drive such as the 4 kW FSB can sustain higher continuous current in a given ambient temperature, but it introduces a moving part that requires periodic filter cleaning and eventual replacement. In applications where ambient temperatures stay below 40 °C and the duty cycle is moderate — sorting conveyors, packaging lines, assembly stations — the fanless design eliminates a failure point and reduces audible noise. If the application runs continuously at near-full load in a hot environment, the 4 kW FSB with forced-air cooling provides more thermal headroom.

What motors can the 3 kW G115D drive?

The 7.7 A rated output current supports standard IE2 and IE3 three-phase induction motors up to 3 kW at 400 V, as well as IE4 synchronous reluctance motors of comparable rating. The drive is optimized for SIMOGEAR 2KJ8 geared motors in distributed conveyor architectures — the wall-mount format places the drive close to the motor, reducing motor cable length and the associated EMC and voltage-drop concerns that accompany long cable runs in centralized VFD installations. Vector control is available for applications requiring precise torque regulation at low speeds, while V/f control covers standard speed-control duties.

Frequently Asked Questions

How does the 3 kW FSB differ from the 4 kW FSB G115D?

Both share the same FSB frame and 425×240 mm footprint, but they differ in two key respects. The 3 kW model (134 mm depth) uses natural-convection cooling; the 4 kW model (169 mm depth) has an integrated fan. The 4 kW also delivers 8.95 A continuous output current for larger motors. If your application needs more than 3 kW, the 4 kW FSB is the next step up within the same mounting footprint. If 3 kW is sufficient and fan-free operation is valued, the 3 kW FSB is the right choice.

What do the I/O suffix codes — AA0, AB0, AF0 — mean for the G115D?

The three suffix variants denote different I/O interface configurations. The exact signal count and terminal assignment for each suffix are not detailed in publicly available distributor listings. All three share identical electrical ratings. The differences affect how digital inputs, digital outputs, and optional analog channels are wired in the field. Consult the G115D operating instructions for the terminal layout specific to each suffix — the choice depends on your control scheme, not on drive performance.

Can the 3 kW G115D be mounted outdoors?

With IP65/IP66 and UL Type 4X enclosure ratings, the G115D is suitable for outdoor installation when mounted with the cable glands specified in the operating instructions. The -30 to +40 °C ambient temperature range covers most outdoor conveyor applications. For direct sunlight exposure, consider a sun shield to keep the housing temperature within the rated range and avoid unnecessary derating.