Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard SENTRON 3VA frame size that bolts into existing 3VA panel cutouts and busbar arrangements. If you're swapping an older 3VA frame (say a 3VA2116-5HL32-0AK0), the footprint and mounting centers are the same; the difference is the current rating and interrupting capacity, not the physical fit.
Thermal derating and real-world loading
At 50 °C it derates to 593 A, at 60 °C to 557 A, and at 70 °C to 520 A. The breaker's maximum power dissipation is 164.5 W (all three poles conducting), which factors into enclosure thermal rise calculations.