Its interrupting ratings are the headline: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. Thermal derating is minimal through 50 °C — still 20 A — then drops to 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. In a sealed panel with ambient near 60 °C, you lose about 1.2 A of headroom; factor that into the load calculation if the panel runs hot.
Panel fit — footprint and auxiliaries
That 76.2 mm width is a 3-pole MCCB standard — it occupies three 25.4 mm module spaces on a DIN rail or panel-mount grid. The 70 mm depth is shallower than many older-frame MCCBs, which helps in tight gland-plate clearance or when mounting flush in a shallow enclosure. Comes with 2 auxiliary switches HP (high-performance) factory-fitted. That means you have two independent signal contacts for status feedback — one for the panel PLC input, one for a remote annunciator or safety chain.