BS PD IEC/TR 62271-306:2012+A1:2018
High-voltage switchgear and controlgear. Guide to IEC 62271-100, IEC 62271-1 and other IEC standards related to alternating current circuit-breakers
BS PD IEC/TR 62271-306:2012+A1:2018 is applicable to a.c. circuit-breakers designed for indoor or outdoorinstallation and for operation at frequencies of 50 Hz and 60 Hz on systems having voltagesabove 1 000 V.