400 A MCCB with TM240 release and undervoltage protection
The 3VA1340-4GF42-0BB0: Interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V — figures that cover most low-voltage distribution fault levels across North American and IEC installations. Rated insulation voltage is 800 V, and the breaker carries a maximum power loss of 92.1 W at rated load. No trip indicator is fitted; the auxiliary switch design uses two auxiliary switches (HP type).
Thermal derating and ambient temperature
The breaker holds full 400 A rating up to 50 °C ambient. Above that, derating applies: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C. Operating range is -25 °C to +70 °C; storage range -40 °C to +80 °C. Panel designers should account for the 92.1 W heat dissipation at full load when sizing enclosure ventilation. The 110 mm depth, 184 mm width, and 248 mm height fit standard SENTRON 3VA mounting footprints.