400 A MCCB with 242 kA interrupting capacity — what that means for your panel
The Siemens 3VA2440-6JQ32-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for 400 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. At 240 VAC it interrupts 242 kA, at 415 VAC and 440 VAC it handles 187 kA, and at 690 VAC it still clears 9 kA. That makes it suited for 4-wire systems where you need to protect the neutral against overload. Communication function is built in — no external module required for basic integration into a plant monitoring system. The breaker also reports power loss at 63.5 W maximum, which matters for enclosure thermal budgeting when you're packing several breakers into a single cabinet.
Lifecycle and sourcing — current production, quoted to order
Mounting and dimensions — panel fit check
The 3-pole body takes up about 138 mm of rail width, so plan your enclosure fill accordingly.