Key ratings and what they mean for your panel
The Siemens SENTRON 3VA2340-6HN32-0AJ0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a breaking capacity of 242 kA at 240 V AC — enough to handle high-fault utility feeds or large transformer secondaries without cascading upstream. At 415 V and 440 V the interrupting rating holds at 187 kA; at 500 V it drops to 121 kA, and at 690 V to 7.5 kA — so for a 480 V distribution panel this breaker clears faults well above typical available fault currents, but on a 690 V drive line you need to verify the available fault current stays under 7.5 kA. Thermal derating is modest: the 400 A rating holds through 50 °C ambient, then steps down to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C — useful to know if this breaker sits in a non-ventilated enclosure near heat sources.
Dimensions and panel fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. Maximum power loss is 96 W, so account for that heat in your enclosure thermal calculation if the panel is tightly packed.
Auxiliary switching and monitoring
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HP type), giving remote status for open/closed and trip conditions — no need to add a separate auxiliary block for basic SCADA feedback. The breaker is designed for line protection (not motor or generator protection), with no undervoltage release, no ground-fault monitoring, and no communication module — it's a straight thermal-magnetic or electronic-trip MCCB for feeder duty.