At 1.1 kW (3.1 A rated, 6.2 A overload), the 6SL3520-0XA21-1AA0 belongs to the 0XA21 sub-series — the FSA mid-to-upper power segment (1.1–1.5 kW) within the 0XA2x catalog code system. The 0XA21-1 sits at the entry of this sub-series: below the 0XA21-5 (1.5 kW) ceiling, above the 0XA20 series (0.37–0.75 kW), sharing the FSA frame's 380 × 156 × 129 mm dimensions and 364.5 × 145 mm bolt pattern.

How does the 0XA2x FSA segment (0XA20 + 0XA21) map to the power range?

The 0XA2x catalog system splits the FSA frame into two sub-series: 0XA20 covers 0.37/0.55/0.75 kW, and 0XA21 covers 1.1/1.5 kW. The split likely reflects internal Siemens commercial grouping — the 0XA20 units share one base price band for the lower FSA power stages, while 0XA21 covers the upper FSA band where the power stage cost is incrementally higher. From the machine builder's perspective, the physical product at 0XA21-1 (1.1 kW, 53.6 W loss) is mechanically and electrically identical to the 0XA61-1 or 1XE41-1 — one mounting footprint, one commissioning workflow, one spare-parts strategy across all catalog code systems.

Key specifications

The drive operates from a 3 AC 380–480 V supply (45–66 Hz) with an output frequency range of 0–550 Hz. High-overload capability delivers 200% for 3 seconds and 150% for 57 seconds. The 350 Ω integrated braking resistor (10 W continuous) supports dynamic braking. Integrated PROFINET and Ethernet IP interfaces connect directly to SIMATIC controllers. The built-in C2 RFI filter meets EN 61800-3 Category C2 conducted emission limits.