Its 800 A continuous current rating holds flat from 40 °C to 60 °C before derating to 767 A at 65 °C and 703 A at 70 °C — useful when the breaker sits in a warm enclosure near other heat sources. Breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V. The ETU320 trip unit gives adjustable long-time pickup (Ir) from 320 A to 800 A and short-time pickup (Ii) from 1200 A to 8000 A, with time delays from 0.5 to 17 seconds. That selectivity range lets you coordinate downstream breakers so only the faulted branch clears. Physical footprint is 120 mm deep, 210 mm wide, 320 mm tall — standard for an 800 A frame. The IP40 front rating means tools or fingers won't reach live parts in an enclosed panel, but the body itself isn't sealed against washdown.
The 210 mm width matches the busbar pitch for 3-pole breakers in most switchgear lineups; the 120 mm depth leaves room for rear-connected bus risers.