ANSI standardclassic designup to 50 kA, 15 kV
IEC & GOST standardup to 50 kA, 24 kV
IEC standardup to 40 kA, 40.5 kV
ANSI standardarc resistantup to 50 kA, 15 kV
IEC standardup to 31.5 kA, 36 kV