What this 3VA2440-5MN32-0HH0 is and what it does
The SENTRON 3VA2440-5MN32-0HH0 is a 3-pole molded case circuit breaker (MCCB) from the 3VA series, specifically designed for motor protection. It carries a continuous 400 A rating across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up, which is the first thing I check when a breaker is going into a crowded enclosure. Interrupting capacity is 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. That 187 kA figure at 240 V tells me this breaker is built for high-fault-capacity industrial services — think large motor control centers or transformer secondaries where the available fault current is substantial. It includes phase failure detection and comes with a shunt trip release (STL) plus two auxiliary switches and one trip alarm switch (HQ). That auxiliary complement means you can wire a remote status indication and a shunt-trip pushbutton without adding external relay logic — saves a DIN-rail slot and a few terminal blocks.
Physical fit and panel integration
Dimensions are 110 mm deep, 138 mm wide, and 248 mm tall. That 138 mm width is the standard 3-pole MCCB footprint for this class — it'll drop into a panel cutout sized for a 400 A frame without reworking the mounting holes. The 110 mm depth leaves room for rear-connected bus bars or a panel-mounting plate. Maximum power loss is 63.5 W — worth factoring into the enclosure thermal calculation if you're grouping several of these in a sealed cabinet.