The 20 kA breaking capacity at 400 V AC per IEC 60947-2 tells you it can safely interrupt a fault current up to that level on a 400 V three-phase system; the 5 kA rating at the same voltage under UL 1077 and CSA C22.2 No. 235 covers North American installations. The 3-pole design switches all three phases simultaneously, which is standard for three-phase motor or distribution circuits.
The 3-module-width footprint (54 mm wide) occupies three 18 mm slots on the rail. Depth is 76 mm (70 mm installation depth), which fits standard 80 mm deep enclosures. The combined terminal at top and bottom accepts supply from any position; the neutral conductor is not switched (3-pole only). Operating position is any orientation, so it works in horizontal or vertical panel layouts. Vibration resistance per IEC 60068-2-6 is ±1 mm at 5 to 25 Hz and 50 m/s² at 25 to 150 Hz, which covers typical industrial panel vibration.
Rated for ambient temperatures from -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, 55% at 70 °C, and 35% at 75 °C.