... 3 Safty,Perfect,Loss energy loss Overview FZN25, FZRN25 vacuum load switch combination units, for three-phase AC 50Hz ring network ... current of any current. Fracture separation using direct-action and vacuum arc chamber linkage. With manual and electric functions. FZN25, ... of transmission, interr upter only when closing and withstand high pressure breaking the moment, so small and light weight. FZN25, ...