What this MCCB carries and where it fits
The Siemens SENTRON 3VA2440-6HN32-0CL0 is a 3-pole molded case circuit breaker (MCCB) on a 4800 A frame, rated 400 A continuously across the full 40 °C to 70 °C ambient range — no derating curve to chase for warm panel environments. Breaking capacity reaches 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The line-protection design (no ground-fault module) keeps the trip curve focused on overload and short-circuit clearing for distribution feeders or large motor branch circuits.
Panel fit and auxiliary complement
At 110 mm deep, 138 mm wide, and 248 mm tall, this MCCB occupies a standard SENTRON 3VA mounting footprint — the same bolt-hole pattern as other 3VA2 frame sizes, so a panel laid out for a 400 A SENTRON accepts this unit without re-drilling. The auxiliary switch block includes 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ type), giving four discrete signal outputs for PLC status monitoring or remote annunciation. An undervoltage release (UVR) is factory-fitted, so the breaker drops on loss of control voltage — typical for emergency-stop chains or undervoltage protection schemes.
Power loss and thermal management
Maximum power loss is 66 W at rated current. In a sealed enclosure, that heat must be vented or the internal ambient kept below 70 °C (the operating maximum) and above -25 °C (the operating minimum). Storage range is -40 °C to 80 °C. The 5 kA limited-to-1-second rating is a short-time withstand figure for selective coordination — useful when this breaker feeds a downstream panel and you need the upstream device to hold during a fault.