On DC circuits it's rated 15 kA at 72 V max — good for control-power or battery-backed buswork, not for high-voltage DC strings. That covers standard 400 V line-to-line industrial supplies across Europe and most of Asia.
Panel fit and derating
It's 36 mm wide — two modular units on a DIN rail. Mount in any position, quick-assembly system snaps onto the rail without tools. Rated 63 A at 45 °C ambient; at 50 °C it derates to 61.05 A, at 55 °C to 59.03 A. The breaker itself tolerates -40 to 75 °C ambient, so the enclosure temp, not the breaker, is your limit.