What this MCCB carries and where it fits
The Siemens SENTRON 3VA1140-4GD46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous 40 A, designed for line protection in distribution panels and industrial switchboards. Its interrupting capacity reaches 121 kA at 240 V, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — a curve that tells you the available fault current at your service voltage governs the selection, not the 40 A frame. The TM210 thermal-magnetic release handles overload and short-circuit protection without an electronic trip unit, so no auxiliary power or communication module is needed. The 70 mm depth and 101.6 mm width fit standard DIN-rail or panel-mount footprints; verify the 130 mm height clears your enclosure door or busbar shroud.
Thermal derating and ambient limits
The 40 A rating holds to 50 °C ambient. At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. If your panel runs hot — near a drive cabinet or in a roof-mounted enclosure — size the load to the 70 °C curve, not the nameplate. Operating range is -25 to 70 °C; storage range is -40 to 80 °C. The 10.8 W maximum power loss is modest for a 4-pole 40 A frame, so internal cabinet heating from this breaker alone is negligible.
Absent features to note
No trip indicator, no undervoltage release, no voltage trigger, no communication function, no ground-fault monitoring, and no other measurement function. If your specification requires any of those, this variant is not the one — you need the electronic-trip or accessory-equipped sibling in the SENTRON family. Rated insulation voltage is 800 V, so it is suitable for 690 V line-to-line systems with margin.