The SINAMICS G115D 6SL3520-2XB41-5AB0 is the I/O variant at 1.5 kW in the compact FSA frame — the highest power rating available in the smallest G115D enclosure. It carries an NCNR (Not Suitable for New Designs) status. At 380 × 156 × 129 mm, FSA is 45 mm narrower and 24 mm shorter than the FSB frame used from 2.2 kW upward, making it the preferred choice when drive mounting space is tight on the machine frame.

What fits in the FSA enclosure at 1.5 kW?

The FSA frame packs a full 3-phase inverter rated for 4.1 A HO continuous (8.2 A at 200% overload) into a 380 × 156 mm footprint — roughly the size of a large terminal box. Natural convection through the cast-aluminum housing handles the full 1.5 kW heat load without a fan. The AB0 suffix adds expanded digital I/O with fail-safe digital inputs for STO, while keeping the control interface entirely terminal-based.

When choose FSA over FSB at 1.5 kW?

At exactly 1.5 kW, the FSA frame is the natural choice — FSB at this power would occupy more mounting surface for no electrical benefit. The FSA-to-FSB transition happens at 2.2 kW, where the higher continuous current exceeds FSA's thermal dissipation capacity. For conveyor zones operating at or below 1.5 kW, FSA delivers the same G115D functionality in the smallest possible package.

How does the I/O variant differ from the PROFINET variant at 1.5 kW FSA?

The AB0 and AF0 share the same 1.5 kW FSA power stage and enclosure. The AB0 uses hardwired digital I/O with F-DI for STO; the AF0 uses PROFINET with PROFIsafe over M12 connectors. At the FSA frame size, where the drive is often mounted directly on small conveyor segments, the AB0's terminal-block simplicity can be an advantage — no network switch port consumed, no GSDML file to manage.