SENTRON 3VA1340-4FF42-0AA0 — 400 A 4-Pole MCCB, TM240 Release
The Siemens 3VA1340-4FF42-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with a 4-pole configuration and a TM240 thermal-magnetic overcurrent release. It carries a maximum breaking capacity of 121 kA at 240 V, derating to 75.6 kA at 415/440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V — so the interrupting rating you need depends entirely on your system voltage and available fault current. This is a line-protection version (not a motor-protection or ground-fault variant), so it's intended for feeder and main breaker duty in distribution panels. The 4-pole design handles three-phase plus neutral, with the N-conductor protection set at 50% of the phase rating — typical for a fully rated system where the neutral needs its own overcurrent element.
Physical footprint: 248 mm high, 184 mm wide, 110 mm deep. That's a standard 4-pole MCCB form factor — it will drop into most SENTRON 3VA switchboard chassis or panel-mount cutouts designed for the 400 A frame. Power dissipation is 92.1 W maximum at rated current — that's heat that has to be managed inside the enclosure.