Siemens SENTRON 3VA1140-3EF32-0JA0 is a 3-pole molded case circuit breaker rated 40 A continuous current at 40 °C, with a TM240 thermal-magnetic release and an integrated shunt trip (STL) for remote tripping. It carries 75.6 kA breaking at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — the 415 V figure is the one that governs most European 400 V distribution panels.
Current derating and thermal limits
The 40 A rating holds flat from 40 °C through 50 °C. Above that it derates: 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 36 A at 70 °C is the ceiling for a hot panel — if your enclosure runs near 65 °C, size the load for 38 A, not 40.
Shunt trip and auxiliary release
This MCCB ships with a shunt trip (STL) as the auxiliary release — no undervoltage release, no ground-fault module, no auxiliary contacts. The integrated auxiliary trip order code is 3VA9688-0BL32. No communication function, no phase-failure detection. It's a straight line-protection breaker with a remote-trip coil; if you need aux contacts or a UVR, that's a different variant.
Physical fit and panel integration
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. Front IP40. It mounts on a DIN rail or panel-mount base; the 76.2 mm width is three pole spaces at 25.4 mm per pole — standard for a 3-pole MCCB in a distribution board. Depth of 70 mm leaves room for the shunt trip wiring behind the front cover.