Breaking capacity and selectivity
The 3VA1340-6EF32-0BF0: Interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 17 kA at 690 V. That 220 kA figure at 240 V gives serious fault-current headroom for large transformer secondaries or high-capacity busway feeds — you can coordinate downstream feeders without worrying about cascading failure.
Thermal derating in hot environments
Rated continuous current holds flat at 400 A from 40 °C through 50 °C. Above that it derates: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, 367 A at 70 °C. In a cement plant control room that hits 55 °C in summer, you lose 8 A — still plenty of margin for a 350 A motor feeder. The operating range spans -25 °C to 70 °C; storage from -40 °C to 80 °C.
Release and auxiliary configuration
TM240 release means a thermal-magnetic trip unit with a 240 A continuous current rating — the breaker frame is 400 A but the trip is set lower, giving adjustability for the actual load. Includes an undervoltage release (UVR) for coordinated shutdown on voltage loss. Auxiliary contacts: 1 auxiliary switch + 1 trip alarm switch (HQ type). The integrated auxiliary trip order code is 3VA9608-0BB11.
Physical fit and power loss
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. Mounts on a DIN rail or panel-mount in standard SENTRON distribution boards. Maximum power loss is 92.1 W — account for that in enclosure thermal calculations if you're packing several breakers in a sealed cabinet. Latching endurance rated at 15,000 cycles.