Line protection MCCB with undervoltage release
The Siemens SENTRON 3VA1140-3EF36-0CH0 is a 3-pole molded case circuit breaker rated for 40 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's configured for line protection — no communication module, no ground-fault monitoring, no phase-failure detection — just a straightforward thermal-magnetic trip curve for feeder or branch-circuit duty. The interrupting ratings span 75.6 kA at 240 V down to 10.5 kA at 690 V, so it handles high available fault current on the low-voltage side of a 480 V or 600 V panel. The 52.5 kA at 415 V covers most European industrial distribution. An undervoltage release (UVR) is built in — part of the auxiliary release design — and the auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ type). That gives you both a status mirror and a separate alarm contact for remote indication when the breaker trips on fault.
Thermal derating and panel fit
The breaker holds its full 40 A rating from 40 °C through 50 °C ambient. 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. If your panel ambient runs above 50 °C, size the downstream load against the derated figure, not the nameplate 40 A. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — fits the same DIN-rail or mounting-plate cutout as other SENTRON 3VA frames in this class. IP40 on the front means it's protected against tools and wires >1 mm, but not against water ingress; keep it inside a sealed enclosure for washdown areas.