Breaking capacity hits 187 kA at 240 V and 121 kA at 415 V — that's enough to interrupt a fault upstream of a 2000 kVA transformer without the arc flashing over to the bus. The shunt trip (STL) lets a remote safety relay or E-stop drop the breaker independently of the overcurrent release, which is the usual way to wire an emergency-off circuit in a panel.
Thermal derating — the real continuous rating
At 55 °C it drops to 154 A, at 60 °C to 148 A, at 65 °C to 142 A, and at 70 °C to 136 A. Maximum power loss is 25.5 W, which matters for thermal rise calculations in a multi-breaker lineup.