What this MCCB carries
The Siemens 3VA2440-5HN32-0AH0 is a SENTRON molded case circuit breaker sized for a 400 A continuous load on a 4800 A frame, 3-pole, designed for line protection in distribution panels. Rated current holds steady at 400 A across the full operating temperature range from 40 °C to 70 °C — no derating needed for warm enclosures or summer ambient conditions. Interrupting capacity varies by system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. That 187 kA at 240 V covers high-fault industrial services and transformer secondaries. Max power loss is 63.5 W — thermal dissipation to account for in enclosure sizing if the panel is tightly packed.
Panel fit and integration
Mounts on a DIN rail or bolts into a panel base. Dimensions: 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is the standard 3-pole MCCB footprint — fits existing SENTRON or third-party busbar systems without re-drilling. Comes with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) factory-fitted — no need to order separate signal contacts for status feedback to a PLC or remote annunciator. No undervoltage release, no ground-fault monitoring, no communication module on this variant. If those are needed, the 3VA family has other order codes with those options built in.