The 3VA1140-6EF32-0BC0: Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. That's serious fault-current headroom for a 40 A frame — it'll ride through a high-energy bolted fault without venting or cascading upstream.
Thermal derating and panel fit
Current rating holds at 40 A from 40 °C through 50 °C, then steps down: 39 A at 55–60 °C, 38 A at 65 °C, 37 A at 70 °C. If your panel ambient runs above 50 °C, you lose 1–3 A — account for it in the load schedule. Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. That 76.2 mm width is a 3-pole standard footprint — drops into a SENTRON panelboard or standalone enclosure without surprises. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Auxiliary release and switching
This unit ships with an undervoltage release (UVR) and two HQ auxiliary switches built in. The UVR trips the breaker when control voltage drops — standard for motor feeder circuits where a loss-of-voltage needs to drop the load. No ground-fault monitoring or communication module on this variant. Maximum power loss is 13.3 W — manageable for a DIN-rail or panel-mount install, but if you're packing multiple breakers in a sealed enclosure, sum the losses and check the thermal rise.