Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — figures that govern fault-clearing at the main or feeder level without cascading upstream. The built-in shunt trip (STL) release lets a remote signal (e.g., emergency-stop contact, undervoltage relay) open the breaker electrically, which is the usual reason a buyer specifies this variant over a plain thermal-magnetic unit.
That matters for panels packed tight or installed in warm enclosures — the 63 A nameplate applies only if the internal panel temperature stays under 50 °C.
The breaker measures 76.2 mm wide by 130 mm tall by 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON or third-party distribution panels without re-drilling.