The part number for a 20amp Square D RCBO is - QO120B10RCBO30F
For further information , visit link below:-
https://www.se.com/au/en/search/QO120B10RCBO30F
https://www.clipsal.com/products/detail?CatNo=QO120B10RCBO30F&tab-document-1=0&itemno=QO120B10RCBO30F
For further information , visit link below:-
https://www.se.com/au/en/search/QO120B10RCBO30F
https://www.clipsal.com/products/detail?CatNo=QO120B10RCBO30F&tab-document-1=0&itemno=QO120B10RCBO30F