The Siemens 3VA2440-7HL32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current (Iu) across a 3-pole configuration, built for line protection duty. It carries an ETU320 electronic trip unit — no communication, no voltage trigger, no ground-fault monitoring — just straightforward overcurrent protection with a trip indicator. Breaking capacity hits 330 kA at 240 V, 242 kA at 415 V, and still holds 52.5 kA at 690 V, so it handles high-fault utility feeds or transformer secondaries without cascading upstream.
What the ratings mean for your panel
The 400 A rating is continuous through 50 °C ambient; above that, derate to 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, 360 A at 70 °C. That thermal curve matters when the breaker shares a crowded enclosure with other heat sources — plan your fill factor around the actual ambient, not the nameplate. The 63.5 W maximum power loss at full load also drives ventilation or spacing decisions inside the panel. Breaking capacity figures are symmetrical fault ratings — the 330 kA at 240 V is the highest in the lineup, making this breaker a fit for low-voltage switchgear with high short-circuit capacity upstream. At 690 V the 52.5 kA still covers most industrial motor-control center bus faults. The 800 V rated insulation voltage (Ui) confirms the breaker is designed for 690 V systems with margin.
Integration notes
Dimensions: 138 mm wide, 248 mm tall, 110 mm deep — standard 3-pole MCCB footprint for panel-mount or DIN-rail adapter. The auxiliary contact package is factory-fitted as 1 auxiliary switch + 1 trip alarm switch (HQ type), so you get remote status and trip indication without adding a separate module. No undervoltage release, no shunt trip, no communication module — this is a standalone line-protection breaker.