ANSI standardclassic designup to 50 kA, 15 kV
550mm, up to 31.5 kA, 12/17.5 kV, 1250 A (IEC)
IEC standardup to 31.5 kA, 36 kV
ANSI standardarc resistantup to 50 kA, 15 kV
IEC & GOST standardup to 50 kA, 24 kV
IEC standardup to 40.5 kV