It protects a three-phase outgoing circuit against both overload/short-circuit (thermal-magnetic trip, D curve) and earth leakage (30 mA sensitivity).
The 30 mA earth-leakage threshold catches insulation faults that could injure personnel; it's the standard for socket-outlet and general-purpose circuits in TN earthing systems.
Certified to AS/NZS 61009.1, IEC 61009-1, and IEC 61009-2-2 — the international and Australian/New Zealand standards for RCBOs. That covers both the overcurrent and residual-current protection functions in one device. Tropicalisation class 2 means it's treated for 95 % humidity at 55 °C, so it holds up in warm, damp panel environments.
