... 20 is three phase AC 50Hz indoor high-voltage switch equipment, which is suitable in the rated voltage ... 20 is three phase AC 50Hz indoor high-voltage switch equipment,which is suitable in the rated voltage ... 12kV electrical power systems. The switch hascapability of making, load bearing, breaking load and ... operation torquenm≤200 FZN21-12/T630-20 Series AC HV Vacuum Load Break Switch