How does current limiting Circuit Breaker reduced the let through energy

Refer to this web information below

https://www.productinfo.schneider-electric.com/compactnsxlegacyuserguide/doca0140-compact-nsx-legacy-user-guide/English/BM_CompactNSXTwin_IEC_354b1ab7_T000226647.xml/$/TPC_ComPactNSX100_630LimitationCurves_354b1ab7_T000227083

https://files.engineering.com/download.aspx?folder=7ab7ad96-6afa-492e-9161-cccd22ac5168&file=BS_Fault_Current.jpg