It carries a continuous rated current of 40 A across the full ambient range from 40 °C to 70 °C with no derating — per the datasheet, the 40 A rating holds at every temperature step from 40 °C through 70 °C, so you don't have to recalculate for a warm enclosure. The 4-pole configuration with adjustable N-conductor protection (OFF or 100%) suits three-phase plus neutral systems where you need to monitor or isolate the neutral conductor.
Trip unit and protection functions
The overcurrent release is an ETU330 electronic trip unit. The ground-fault monitoring uses summation current formation on L + N conductors, which detects leakage without a separate sensor. Power loss is 1.2 W maximum, negligible for panel thermal budgeting.
The width of 140 mm is the standard 4-pole MCCB footprint for this SENTRON frame size — it occupies four 35 mm DIN-rail mounting spaces. Panel builders should verify the depth clearance for cable connections and any auxiliary accessory modules that clip onto the sides or front.