400 A MCCB with TM240 Release
It carries a TM240 thermal-magnetic overcurrent release, meaning the thermal pickup and magnetic trip are set for a 400 A frame — no electronic adjustment, just reliable bimetal and solenoid response for motor and feeder circuits. The interrupting ratings are serious: 187 kA at 240 V, 121 kA at 415 V, and still 11.9 kA at 690 V, so it handles high-fault utility feeds or transformer secondaries without needing a current-limiting fuse upstream.
Current Carrying and Thermal Derating
Above that it derates in steps: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C. The maximum power loss is 92.1 W, so ventilation matters in a sealed enclosure.
No end-of-life notice or successor has been issued for the 3VA1340-5EF42-0AA0.
Storage range is wider: -40 °C to 80 °C, which matters if you're warehousing spares in an unheated building.