Breaking capacity hits 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that cover most industrial fault levels without cascading upstream. Insulation voltage rated 800 V. Rated current holds steady at 40 A from 40 °C through 50 °C, then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. That means in a warm panel — say 55 °C ambient — you lose 1.6 A of headroom; factor that into the load schedule.
Three poles, 40 A continuous at 40 °C, line-protection design — this MCCB is sized for a feeder or branch circuit in a 400 V distribution panel. At 415 V the 75.6 kA still covers most industrial transformer ratings up to 2000 kVA.
The 3-pole frame fits standard Siemens 3VA mounting bases and busbar systems.