What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA2440-5HL32-0KH0 is a 3-pole molded case circuit breaker rated for 400 A continuous — and it holds that rating all the way to 70 °C ambient without derating, which is unusual for a frame this size. That means you can pack it into a warm cabinet or a sunny panel without losing headroom on the main feeder. Interrupting capacity is 187 kA at 240 V, dropping to 121 kA at 415 V and 9 kA at 690 V. That 187 kA figure at 240 V tells you this breaker is built for high-fault locations — substation secondaries or large motor control centers where the available fault current is serious. At 690 V the 9 kA rating is lower than some, so check your system's prospective fault level if you're running 690 V. It ships with a shunt trip release (STL) and a 2-auxiliary-switch plus 1-trip-alarm-switch configuration. That gives you remote tripping capability and status feedback without adding external relays. The basic switch core is order code 3VA2440-5HL32-0AA0.
Panel fit and mounting
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That 110 mm depth is the key number for enclosure selection — it's the projection from the mounting surface to the front of the breaker, so your enclosure door needs clearance for it plus any handle or rotary operator. The 138 mm width is standard for a 3-pole frame in this class; it'll fit existing SENTRON panel cutouts without modification.