What this MCCB carries and where it fits
The Siemens SENTRON 3VA1140-6GF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C ambient. It uses a TM240 thermal-magnetic overcurrent release — that's a fixed thermal trip paired with a magnetic short-circuit pickup, no electronic adjustment. The breaking capacity at 240 V AC is 220 kA, which drops to 154 kA at 415 V and 121 kA at 440 V; above that, at 500 V and 690 V, it still holds 17 kA. That 220 kA figure at 240 V tells you this breaker is sized for high-fault locations — think main distribution boards or feeder circuits close to a transformer where the available fault current is severe.
Ratings that govern the real decision
The 40 A rating holds flat from 40 °C through 50 °C, then derates only a single amp at 55 °C and 60 °C, and drops to 38 A at 65 °C and 37 A at 70 °C. That's a tight thermal curve — the breaker doesn't shed much capacity as the panel warms, which matters if you're packing it into a crowded enclosure. The rated insulation voltage is 800 V, and the maximum DC operational voltage is 600 V, so it can also serve DC bus or battery-string applications within that limit. The front face carries IP40 protection — fine for a dry indoor panel, but not for washdown or outdoor exposure.
Panel integration notes
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep. That 70 mm depth is the body only — account for handle throw and any accessory modules (like the optional motor drive) when laying out the enclosure depth. The N-conductor protection is rated at 100%, meaning the neutral pole is fully rated, not reduced. No communication function onboard, so if you need remote monitoring or trip-data logging, you'll add an external communication module or a separate power-monitoring device.