What are the standards applied for the HV circuit breakers ?

The HV circuit breakers (LF, SF, Evolis, HVX, EasyPact EXE) meet the following standards :

IEC 62271-100 :
High-voltage switchgear and controlgear - alternating-current circuit-breakers

IEC 62271-1 :
High-voltage switchgear and controlgear - common specifications for alternating current switchgear and controlgear