What this MCCB is and where it fits
The Siemens 3VA1140-6EF32-0DC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a rated continuous current Iu of 40 A across three poles, with a TM240 thermal-magnetic overcurrent release — meaning the thermal element handles overloads and the magnetic element handles short-circuits, no external trip unit needed. Breaking capacity is the headline number for this class: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. That 220 kA figure at 240 V tells you it's built for high-fault-current mains entrances or large sub-distribution boards where the available fault current is substantial — not a downstream feeder breaker. The 40 A rating holds flat from 40 °C through 50 °C, then derates to 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's a clean thermal curve — no surprise drop at 40 °C, so if your panel ambient stays under 50 °C you get the full 40 A without headroom padding.
Panel fit and auxiliary hardware
The 3VA1140-6EF32-0DC0 measures 70 mm deep by 76.2 mm wide by 130 mm high. That 76.2 mm width is a standard 3-pole MCCB footprint — it lands on a DIN rail or mounts directly to a backplate without crowding adjacent breakers. The IP40 front face keeps dust out of the enclosure; the rest of the breaker is inside the panel, so IP40 is sufficient for a clean indoor switchboard. It ships with an undervoltage release (UVR) fitted — the release design is the UVR type, and the auxiliary contact version is 2 auxiliary switches HQ (high-quality, typically rated for signal-level switching). The integrated auxiliary trip order code is 3VA9608-0BB25, which is the factory-fitted accessory you'd order if you need a spare or a replacement sub-assembly. No communication module, no voltage trigger, no phase failure detection, no ground fault monitoring — this is a straight line-protection MCCB. If you need those functions, you step up to the electronic-trip variants in the 3VA family.
Lifecycle and sourcing posture
For BOM-freeze or compliance documentation: the part carries a reference code per DIN EN 81346-2 (Q for power distribution). The rated insulation voltage Ui is 800 V, and the storage temperature range is -40 °C to 80 °C, with an operating range of -25 °C to 70 °C. Latching endurance is rated at 15,000 operations.