Key ratings and what they mean for the line
The Siemens 3VA1140-6EF36-0HA0 is a SENTRON molded case circuit breaker (MCCB) carrying a 40 A continuous rating at 40 °C — that is the full-load current it holds without tripping on a warm panel day. Its interrupting capacity hits 220 kA at 240 V, meaning it can safely clear a bolted fault up to that level without upstream devices needing to coordinate; at 415 V it still handles 154 kA, and at 690 V it's rated 17 kA. That high short-circuit rating keeps the line moving through a fault event — no cascading failures, no extended downtime. The TM240 overcurrent release is a thermal-magnetic design. Rated insulation voltage is 800 V. Power loss maxes at 10.8 W — negligible for panel heat budget, but worth noting if you're packing several breakers in a sealed enclosure.
Integration into the panel
The 3VA1140-6EF36-0HA0 is a 3-pole MCCB with a width of 76.2 mm, depth of 70 mm, and height of 130 mm. The shunt trip (STL) auxiliary release is factory-installed. The supplied basic switch carries order code 3VA11406EF360AA0 — that's the internal switching mechanism. If you're swapping a failed unit, verify the shunt trip voltage matches your control circuit; the release design is a shunt trip (STL), not an undervoltage release.
Temperature derating and ambient range
The breaker holds 40 A from 40 °C through 50 °C (-). At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If your panel ambient runs above 50 °C, size the breaker one frame step up or accept the derated figure.