The Siemens SENTRON 3VA2440-6HN32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with an ETU350 electronic trip unit for line protection. The 400 A rating holds steady through 50 °C — only above that does it begin to derate, reaching 360 A at 70 °C. That means in a warm panel you still get full 400 A headroom up to 50 °C, which covers most industrial enclosures without oversizing. Breaking capacity is substantial: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. These are the interrupting ratings at the respective voltages — critical for verifying selectivity and SCCR compliance in a distribution panel. The unit ships with 2 auxiliary switches (HP version) for remote status indication.
Dimensions: 138 mm wide, 248 mm high, 110 mm deep. Panel builders should verify the 110 mm depth against gland-plate clearance and busbar reach, but it is a common dimension for this rating. Mechanical endurance is rated at 15 000 operations — typical for a 400 A MCCB used in distribution, not for frequent switching duty. Max power loss is 63.5 W, which matters for thermal management inside a sealed enclosure.