The Siemens SENTRON 3VA2440-6HL42-0AA0 is a 4-pole molded case circuit breaker rated for 400 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. The interrupting ratings climb to 242 kA at 240 V and hold at 187 kA through 440 V; at 690 V it still clears 9 kA.
The 3VA2440-6HL42-0AA0 measures 248 mm high by 184 mm wide by 110 mm deep. That 184 mm width on a 4-pole frame is typical for the SENTRON 3VA platform — it lands on the same mounting footprint as other 3VA breakers in this frame size, so a panel laid out for a 3VA2225-5HN42-0BB0 or 3VA2116-5HL32-0AK0 will accept this 400 A unit without re-drilling the backplate. The 110 mm depth leaves room for rear-connected busbars or a standard DIN-rail adapter plate.