What this 400 A MCCB delivers — and where the ratings matter
The Siemens 3VA2340-7HN32-0KA0 is a SENTRON molded case circuit breaker rated for 400 A continuous current at 40 °C through 50 °C, with a 3-pole line-protection design and a shunt trip (STL) auxiliary release. The interrupting ratings climb to 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V — meaning this breaker handles high-fault-capacity main feeders without cascading upstream devices. At 55 °C the continuous rating begins to derate to 385 A, dropping to 340 A at 70 °C, so panel ambient temperature directly governs the usable ampacity. The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a standard SENTRON 3VA frame size that fits existing 3VA panel cutouts and busbar arrangements. Maximum power loss is 96 W, which matters for enclosure thermal rise calculations in sealed cabinets.
Panel fit and compliance documentation
The 3VA2340-7HN32-0KA0 drops into the standard SENTRON 3VA footprint — same 138 mm width and 248 mm height as the 3VA2163-8HM32-0AA0, so a panel already cut for that frame accepts this breaker without rewiring or busbar modification. Compliance documentation (RoHS, REACH, UL, IEC) is provided with the shipment; the brand maintains full IEC 60947-2 certification for this series.