What this MCCB carries and where it fits
The Siemens 3VA2440-6HN32-0JL0 is a SENTRON molded case circuit breaker rated for 400 A continuous at ambient temperatures from 40 °C through 70 °C — no derating needed across that span. That makes it a straight drop-in for a 400 A bus or feeder that sees a warm enclosure. Breaking capacity sits at 242 kA at 240 V, 187 kA at 415/440 V, and 121 kA at 500 V; at 690 V it still clears 9 kA. For a line-side fault with those SCCR numbers, this breaker holds coordination without upstream fuses in most industrial panels.
Panel fit and integration
Dimensions are 248 mm high × 138 mm wide × 110 mm deep. That's a standard SENTRON 3VA2 frame footprint — it occupies the same cutout as other 3VA2 breakers in the 400 A class. The 3-pole construction with line protection design means it's set up for feeder or main breaker duty, not motor circuit protection. Power loss at full load is 63.5 W, so factor that into enclosure thermal calculations if you're packing multiple breakers in a single panel.
Auxiliaries and releases
Factory-fitted with a shunt trip release (STL) for remote tripping and the HQ auxiliary switch block — that's two form-C aux contacts, one trip alarm contact, and one electrical alarm contact. No undervoltage release, no ground-fault monitoring, no communication module on this variant. If you need remote status or emergency trip, the wiring points are already there; if you need UVR or GF, this isn't the right order code.
Environmental and storage
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses. The storage maximum is the handling limit, not the running limit — the breaker can sit in a cold truck or hot container without damage.