Rated voltage   24kV

Test voltage 1" 50/60Hz:

   . against earth and between the phases   50kV

   . between the open contacts   60kV

Impulse withstand voltage:

   . against earth and between the phases   125kV

   . between the open contacts   145kV

Rated frequency   50-60Hz

Rated current   630A

Making capacity   50kA

Rated short time withstand current 3"   21kA

   . Rated peak   50kA

Internal arc (IEC298/CEI17-6 app.A-A)   16kAx1"