Siemens 3VA2340-6HN32-0AC0 SENTRON MCCB, 400A, 3-Pole, 242kA

400 A MCCB for high-fault panels

Its interrupting capacity hits 242 kA at 240 V AC and still holds 187 kA at 415/440 V, dropping to 121 kA at 500 V and 7.5 kA at 690 V — that SCCR headroom means it handles high-fault utility feeds without cascading upstream. Rated current holds flat at 400 A through 50 °C ambient; above that it derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C.

Panel fit and thermal management

That 138 mm width on a 3-pole frame is standard for SENTRON 3VA2 breakers — it bolts into the same bus-bar grid as other 400 A frames in the series.