What this 400 A MCCB does on your line
That means it holds its full 400 A rating in a warm panel, not just on a cool bench. Three-pole construction with motor protection design, so it's built to handle induction motor starts and overload profiles, not just resistive heater banks. Interrupting capacity hits 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 9 kA at 690 V.
Sourcing and lifecycle — still a current-production part
This 3VA2440-7MQ32-0AA0 carries a lifecycle status of 'current', meaning Siemens still manufactures it as an active catalog item. No last-time-buy notice, no successor code to track — it's the standard offering in the 3VA2 motor-protection MCCB family. For BOM freeze or PCN-watch purposes, this is a stable line. The 3VA2 series has been the SENTRON MCCB platform for several years; no phase-out signals on this rating.
That 110 mm depth is the critical number for shallow backpanel enclosures — verify your cabinet depth clears it with wiring space behind. Communication function is built in — this variant supports the 3VA2 communication module for remote trip indication and power monitoring over PROFIBUS or PROFINET, depending on the plug-in module selected separately. No separate voltage trigger or undervoltage release on this order code; those are add-on accessories.
Protection settings and trip characteristics
Adjustable overload protection: initial value set at 80 A, full-scale value 400 A. That's a 5:1 adjustment range — you can dial the thermal-magnetic trip down to 80 A for a smaller motor or up to 400 A for the full frame rating. Short-time delay adjustable from 3 s minimum to 25 s maximum, giving selectivity coordination with downstream breakers. Short-circuit withstand: limited to 5 kA at 1 second — this is the short-time withstand rating for selective coordination. No trip indicator, so remote signaling requires the communication module or auxiliary contacts.