3-pole MCB for panel protection
The 6 kA EN 60898 figure is the residential/commercial standard; both are listed, but the higher IEC value is what a panel builder coordinating with a 25 kA-rated main breaker needs to see. The C-curve (not explicitly stated in the spec rows but implied by the class and peer data) means it holds through mild inrush — fine for general lighting, control transformers, and mixed resistive-inductive loads, but not for high-starting-current motors where a D-curve would be preferred. The 72 V DC maximum rating applies only to DC-side use — this is primarily an AC breaker, so don't spec it for a DC bus above that voltage. The 440 V AC maximum for multi-phase operation gives a bit of headroom above the 400 V nominal, useful on a 415 V supply common in some regions. Temperature range of -40 to 75 °C covers unheated enclosures in cold climates and hot panel interiors near transformers — no derate worry until you're above 75 °C ambient.
Panel integration
Accepts solid conductors up to 35 mm², which covers most feeder and branch circuit wiring up to the rated current.