That 400 A holds flat through 50 °C (–); above that it derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C (–) — so if this lives in a hot enclosure, the actual continuous duty is lower than the faceplate number. Breaking capacity is the headline: 242 kA at 240 V, 187 kA at 415 V and 440 V (–), 121 kA at 500 V, and 40 kA at 690 V. That 242 kA at 240 V puts it in the high-interrupting class — it clears faults without cascading upstream, which matters for a main or tie breaker in a high-fault panel. The 3-pole design suits three-phase line protection.
Footprint: 110 mm deep, 138 mm wide, 248 mm tall. Power loss at full rated current is 98.5 W maximum. Latching endurance is 15,000 operations.