What this MCCB does on the line
At 690 V the rating drops to 4.5 kA, so this is a 400 V class breaker, not a 690 V main. The shunt trip release (STL) on this variant lets a remote signal — from an emergency-stop circuit, a fire-alarm relay, or a PLC safety output — trip the breaker open.
Thermal derating — the real ampacity
At 55 °C it derates to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A.
The 3-pole footprint matches standard SENTRON 3VA2 cutouts; if you are replacing a 3VA1 frame, check the depth — the 3VA2 is deeper by roughly 10 mm.