Siemens SENTRON 3VA2340-6HL32-0JC0 — 400 A MCCB with High Interrupting Capacity
The breaker carries a shunt trip (STL) and two auxiliary switches (HQ) factory-installed, so it integrates directly into emergency-stop or remote-trip circuits without additional accessory wiring.
Above that, the breaker steps down: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. If the panel ambient runs at 60 °C, the load must be capped at 370 A, not the nameplate 400 A. Maximum power loss is 96 W, which matters for enclosure heat calculations in sealed or high-fill-factor cabinets.
This MCCB delivers 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. For most 400 V-class industrial systems (415 V or 440 V), the 187 kA rating covers nearly any transformer secondary or busway fault scenario.
Depth of 110 mm leaves clearance for rear-connected bus bars or cable lugs in a typical 400 mm-deep enclosure. No trip indicator is fitted — fault status comes from the auxiliary switch contacts wired to a PLC or annunciator.