What this MCCB carries on the nameplate
The Siemens SENTRON 3VA2440-6HN32-0BH0 is a 3-pole molded case circuit breaker rated for 400 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed in a warm panel. Breaking capacity hits 242 kA at 240 V AC, drops to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 9 kA at 690 V. That 242 kA figure at 240 V is the headline number for high-fault service-entrance or distribution applications where the available fault current is serious. The unit includes an undervoltage release (UVR) as the auxiliary release, plus a 2-auxiliary-switch + 1-trip-alarm-switch configuration for status feedback to a PLC or annunciator.
Panel fit and integration notes
Dimensions: 248 mm tall, 138 mm wide, 110 mm deep. That 110 mm depth is the key constraint for enclosure depth — it fits standard 200 mm deep panels with room for wiring gutters. The 138 mm width for a 3-pole frame is typical for this class; check your existing busbar or lug kit spacing. No communication module onboard (no Modbus, no PROFIBUS), so trip status comes through the auxiliary switch wiring only. The undervoltage release (UVR) will trip the breaker if control voltage drops — plan the control power supply accordingly.
Breaking capacity and selectivity headroom
The 242 kA at 240 V is the maximum interrupting rating on this frame. At 415 V it's still 187 kA — that's enough for most industrial distribution boards downstream of a transformer. The 9 kA at 690 V is a sharp drop; if your system runs 690 V with high fault current, this breaker may not coordinate without upstream current limiting. The 400 A continuous rating is flat across the 40-70 °C range, which is unusual — most MCCBs derate above 40 °C. That means you can load it to 400 A even in a hot enclosure without recalculating.