What the ratings mean for fit
The 3VA2440-6HN32-0JA0 is a SENTRON molded case circuit breaker (MCCB) sized for 400 A continuous duty across the full 40 °C to 70 °C ambient range — no derating needed up to 70 °C, which is unusual and simplifies panel thermal budgeting for tight enclosures or high-ambient switchrooms. The 4800 A frame rating means the breaker's internal mechanism and contact structure are built for that maximum current; the actual trip unit sets the continuous rating. Breaking capacity is what decides whether this breaker clears a fault without upstream coordination failure: 242 kA at 240 V, 187 kA at 415 V, 121 kA at 500 V, and 9 kA at 690 V. At 415 V it handles 187 kA — that is well into high-fault-current industrial distribution, so it will hold its own on large transformer secondaries or near utility tie-ins. The 9 kA at 690 V is a drop-off; if your system runs 690 V and fault current exceeds that, you need a current-limiting upstream device or a higher-rated frame.
Line protection configuration
This variant is designated for line protection — the basic switch version is 3VA2440-6HN32-0AA0. It ships without auxiliary switches or ground-fault monitoring, but includes a shunt trip (STL) undervoltage release. No communication function or trip indicator on this build; if remote signaling or status feedback is needed, order the version with the auxiliary switch block. The 63.5 W maximum power loss at rated current should be factored into enclosure ventilation, especially if multiple breakers are ganged.
Physical integration
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. It is a 3-pole unit that mounts on a DIN rail or direct panel-mount — typical for SENTRON 3VA frames. The 110 mm depth is shallow enough for most 200 mm deep enclosures with room for rear cabling. Panel builders should verify the handle clearance and arc-chamber venting per Siemens mounting guidelines; the breaker requires no side clearance for derating if ambient is within the rated 70 °C limit.