Siemens SENTRON 3VA2340-7HN32-0JC0 — 400 A MCCB with Shunt Trip
The Siemens SENTRON 3VA2340-7HN32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C ambient, with a maximum breaking capacity of 330 kA at 240 VAC. It carries a shunt trip release (STL) and two auxiliary switches (HQ) factory-installed, making it suited for remote-trip and status-monitoring applications in distribution panels.
Breaking Capacity and Selectivity Planning
The 330 kA at 240 VAC is the highest short-circuit rating on this frame size — per the datasheet, it drops to 242 kA at 415 VAC and 187 kA at 500 VAC, then to 7.5 kA at 690 VAC. For a site engineer coordinating with upstream protective devices, the 400 A continuous rating holds flat from 40 °C through 50 °C (no derating needed), then steps down to 385 A at 55 °C and 340 A at 70 °C. That thermal curve governs the actual ampacity in a sealed enclosure.
Panel Integration and Dimensions
The 3VA2340-7HN32-0JC0 measures 248 mm high by 138 mm wide by 110 mm deep — a standard SENTRON 3VA frame footprint. It mounts on a DIN rail or directly to a backplate via the four corner slots. The shunt trip (STL) operates on a separate control voltage; verify polarity and coil rating against the panel's control transformer before wiring. The two auxiliary switches (HQ) provide Form C contacts for status feedback to a PLC or annunciator.
Environmental and Storage Limits
Storage temperature range is -40 °C to 80 °C; operating ambient is -25 °C to 70 °C. Maximum power loss at rated current is 96 W — factor that into enclosure thermal calculations for a multi-breaker lineup.