At 240 V it interrupts up to 76 kA; at 415 V that drops to 53 kA, at 440 V to 32 kA, and at 500 V to 12 kA — so for a 400 V distribution panel the 53 kA figure is the one that governs SCCR coordination downstream. Continuous current rating is 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C through 70 °C — no derating needed for most panel ambient conditions, but worth checking if the breaker sits near a heat source or in a sealed enclosure above 55 °C.
The 76.2 mm width (3 in) matches the common 3-pole MCCB slot; plan for 70 mm depth clearance behind the panel door, including wiring bend radius.