The Siemens 3VA1140-6EF32-0AE0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in 3-pole configuration. Its TM240 thermal-magnetic release is fixed at 40 A continuous current, and it holds that rating from 40 °C up through 50 °C — no derating needed in a warm panel. Above that, it steps down to 38.4 A at 55 °C and 36 A at 70 °C, so if your enclosure runs hot, check the ambient curve before committing the BOM line.
Interrupting capacity and what it means for your panel
This MCCB delivers 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. Those are the maximum fault currents it can safely interrupt without welding contacts or venting arc gas into the enclosure. For a 480 V panel (common in North American industrial), the 121 kA at 440 V is the closest published figure — that's well above what most distribution transformers can deliver, so you've got headroom for selectivity coordination downstream. At 690 V the 17 kA rating still covers most motor-drive branch circuits.
Physical fit and panel integration
The 3VA1140-6EF32-0AE0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — it drops into the same mounting slots as other SENTRON 3VA breakers. The IP40 front protection means it's sealed against tools and fingers on the front face, but the terminals are open for wiring; mount it inside a panel with a door for full IP protection. Four HQ auxiliary switches are built in, so you get status feedback without adding a separate block.