The Siemens SENTRON 3VA1140-6EF32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a 40 A rated continuous current Iu and a TM240 thermal-magnetic overcurrent release. Its interrupting capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V — figures that place it in the high-fault category for industrial panelboards and distribution switchboards where SCCR headroom is a design constraint. The TM240 release means the thermal element is fixed at 40 A; no field-adjustable thermal dial, so the breaker is sized for a specific continuous load.
Ratings and what they mean for fit
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 means in a panel with ambient at 50 °C you can load the breaker to its full 40 A nameplate; above that you must account for the thermal curve. The 800 V rated insulation voltage Ui tells you the breaker is suitable for 480/277 V and 600 V systems with margin, but the 690 V interrupting capacity drops to 17 kA — so on a 690 V line you need to verify the available fault current stays under that. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm switch (HQ version). That gives you two form-C signals for status feedback and a dedicated alarm contact that changes state only on a trip event — useful for remote fault annunciation without wiring through the aux contacts. Endurance is rated at 15,000 operations mechanical/electrical latching. For a panel MCCB that sees infrequent switching (typically a handful of operations per year), this is more than adequate; it is not a contactor replacement for frequent motor starting.
Panel integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — three 25.4 mm pole centers — so it fits existing DIN-rail or panel-mount layouts without re-drilling. Front IP40 protection means it is suited for enclosed panel mounting where the door provides the environmental seal.