It's configured for line protection — meaning it's the main feeder breaker in a distribution panel, not a motor-protective device. Breaking capacity is the headline here: 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. For a 400 A frame, those numbers put it in the top tier of SCCR headroom. Thermal derating is published: full 400 A up to 50 °C ambient, then 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C.
Panel integration and auxiliary wiring
That gives you one N/O or N/C for status feedback and one dedicated to signaling a trip event. If you need remote monitoring or undervoltage protection, you'll add those as external modules. Maximum power loss is 63.5 W — that's the heat the breaker dissipates at full rated current. In a sealed enclosure, factor that into your thermal budget; it's not a lot for a 400 A frame, but it's not negligible either.