The 3VA1140-3EF32-0DH0: Full 40 A rating holds through 50 °C; above that it 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 70 °C ceiling matches the top of the derating curve — the breaker runs at 36 A in a hot enclosure, which is the real number to use for a panel sitting near a furnace line or in a South Asian summer.
Integrated undervoltage release and auxiliary contacts
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that drops into most SENTRON distribution panels and switchboard chassis without re-drilling. No voltage trigger, no communication function, no phase failure detection — this is a straight thermal-magnetic breaker for basic line protection, not a smart metering device.