Because IEC standards are adopted globally, you can buy the localized version from your country’s standards organization:
Added specific requirements for resistance to Temporary Overvoltages (TOV) to improve reliability during grid fluctuations. iec 61009-1 pdf
IEC 61009-1:2024. Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses ( IEC Webstore Because IEC standards are adopted globally, you can