FZN21-12 Series Indoor High Volgate Break Switch 1 ISO9001:2000 2 12KV 3 Safty,Perfect,Loss ... appliances mainly by frame, isolating switch (or fuse charging separate switch), vacuum interr../upter, grounding switch, operating mechanism and other components. ... spring, the CO can be fast operation. Isolation switch, vacuum switch, grounding switch interlock each other in order to prevent misuse.Main ...