The Siemens 3VA1140-4EF32-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across a 40 to 50 °C ambient range, derating to 37 A at 70 °C.
Breaking capacity and what it means for your panel
This breaker delivers 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — the interrupting ratings drop further to 11.9 kA at 500 V and 690 V.
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB width for a 40 A frame. The undervoltage release coil draws its power from the line side; verify the control transformer sizing if you're feeding the UVR from a separate 24 VDC supply — this one uses a line-voltage UVR.
No successor has been announced. For BOM freeze or long-term planning, this is a standard-production SENTRON part, not a phase-out item.
Maximum power loss is 13.3 W. The derating curve above 50 °C is linear: 1 A drop per 5 °C step, so at 70 °C you lose 3 A from the 40 A base.