Three poles, 20 A continuous at 40 °C — and it holds that rating right up to 55 °C before it starts to taper (19 A at 60–70 °C). Breaking capacity lands at 52.5 kA at 240 V, 32 kA at 415 V, and still delivers 7.5 kA all the way up to 690 V. That's a lot of fault-clearing headroom for a 20 A frame; you're not going to run out of interrupting capability on a typical 480 V commercial or light industrial service. Power loss peaks at 12 W — negligible for panel thermal budgeting, but worth noting if you're packing a dozen of these in a sealed enclosure.
Built-in auxiliary release and switches
The auxiliary switches are pre-integrated; you don't need to order them separately or carve out accessory slots.
Footprint is 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). That's a standard 3-pole MCCB width — it'll slot into a SENTRON panelboard or a DIN-rail adapter without surprises. Spring-cage terminals on the line and load sides; strip length and torque specs are in the Siemens mounting instructions. No trip indicator on the front face, so you'll rely on the auxiliary switch or a downstream indication circuit for status.