The Siemens 3VA2340-7HN32-0AA0 is a SENTRON molded case circuit breaker (MCCB) built for line protection — 3-pole, rated 400 A continuous, with an ETU350 electronic trip unit. The interrupting ratings climb to 330 kA at 240 V, 242 kA at 415 V, and 187 kA at 500 V, tapering to 7.5 kA at 690 V. That kind of short-circuit capacity means it handles high-fault utility feeds or transformer secondaries without cascading upstream.
Thermal derating and panel fit
The breaker carries its full 400 A up to 50 °C ambient. Above that it derates: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, 340 A at 70 °C. If the enclosure runs hot from other gear, size the feeder for the derated number, not the nameplate. Dimensions are 248 mm high × 138 mm wide × 110 mm deep — a standard MCCB footprint that drops into a SENTRON panelboard or standalone enclosure without gland-plate rework.
What the ratings mean for the panel
The 800 V rated insulation voltage (Ui) means the breaker is designed for 690 V systems with margin. The 96 W maximum power loss matters for thermal management inside a sealed enclosure — account for it in the cooling calc if the panel is tightly packed. IP40 on the front is typical for a panel-mounted MCCB; the line-side and load-side terminals are not sealed, so the enclosure provides the overall IP rating.