The Siemens 6SL3520-1XA62-2AF0 is the full-featured AF0 variant of the SINAMICS G115D at the 2.2 kW (3 hp, 5.9 A) transition power — the first FSB frame size above the FSA range, in a fanless passive-cooled enclosure. It combines PROFINET/EtherNet/IP, a local remote panel, and daisy-chain power and communication connectors in the larger FSB form factor that provides the additional heatsink surface area needed beyond 1.5 kW.

Why does 2.2 kW switch from FSA to FSB?

At 1.5 kW and below, the compact FSA frame (380 × 156 × 129 mm) dissipates heat adequately through natural convection. At 2.2 kW, the higher switching losses require a larger heatsink — the FSB frame (425 × 180 × 134 mm) provides roughly 50% more surface area. The drive remains fanless; the larger frame is purely a thermal management decision. This makes the 2.2 kW FSB the entry point to the mid-power G115D platform while retaining the zero-moving-parts reliability of passive cooling.

Frequently Asked Questions

Can I daisy-chain a 2.2 kW AF0 with FSA drives downstream?

Yes. The Q4/2 connectors and M12 communication ports are identical across FSA, FSB, and FSC frames. A 2.2 kW FSB AF0 can feed downstream 1.5 kW or smaller FSA drives without any adapter or compatibility concern. The daisy-chain current limit (25 A per connector) is the only constraint — and at 5.9 A for the 2.2 kW unit, there is plenty of headroom for downstream FSA loads.