400 A MCCB with 187 kA interrupting capacity — motor protection variant
The Siemens SENTRON 3VA2440-5MN32-0BA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current across the full ambient range from 40 °C through 70 °C — no derating needed up to that ceiling. Its interrupting capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V, so it handles high-fault utility feeds and large motor branch circuits without cascading upstream. This is the motor protection design variant, meaning the thermal-magnetic trip curve is shaped for motor starting inrush — it holds through the 4 to 17 second short-time delay window before clearing a bolted fault. Phase failure detection is built in, so a lost phase on the line side trips the breaker rather than letting the motor single-phase and burn. The breaker ships with an undervoltage release (UVR) fitted, which drops the trip mechanism when control voltage falls below the dropout threshold — standard for applications where a loss of control power must disconnect the load automatically. No auxiliary switch is included on this order code, so if you need remote status feedback, plan for a separate aux contact module.
Panel fit and integration
Dimensions are 110 mm deep, 138 mm wide, and 248 mm tall — a standard 3-pole MCCB footprint that drops into most SENTRON panelboard and enclosure cutouts without re-drilling. The 400 A frame uses bolted lug connections; verify busbar spacing and lug kit compatibility against your existing panel layout. Maximum power loss is 66 W, so factor that into enclosure thermal rise calculations — especially in a sealed stainless steel enclosure where natural convection is limited.
Environmental and storage limits
Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The storage limits govern handling and warehousing, not running conditions — the breaker can sit in a cold warehouse or hot truck without damage.