What the interrupting ratings mean for your panel
The 3VA2440-7HM32-0AA0 is a Siemens SENTRON 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C through 70 °C — no derating needed across that span, which simplifies panel layout when the breaker sits near other heat sources. The interrupting ratings climb to 330 kA at 240 V AC and hold at 242 kA at 415 V and 440 V AC; at 500 V AC it still clears 187 kA. At the full rated operating voltage of 690 V AC the breaking capacity drops to 9 kA, so the coordination study needs to confirm the available fault current at that voltage level. The ETU330 electronic trip unit handles the overcurrent protection algorithm, and the line-protection product version means it is configured for feeder or main breaker duty rather than motor or generator protection.
Panel integration and physical fit
The breaker measures 138 mm wide, 248 mm high, and 110 mm deep — a standard 3-pole MCCB footprint for 400 A frame size. Front face carries IP40 protection, adequate for enclosed panel mounting where the door provides the environmental seal. The 63.5 W maximum power loss at rated current matters for thermal rise inside a sealed enclosure; the panel builder should account for that dissipation when sizing ventilation or forced-air cooling.