FZN21-12D / T630-20 is three phase AC 50Hz indoor high-voltage switch equipment, which is suitable in the rated voltage 12kV electrical power systems. The switch has capability of making, load bearing, breaking load and overloading current. It can also break or make the idling long-line, the transformer and the capacitor.Load switch main technical parameters:1) Rated voltage: 12kV2) Rated frequency: 50Hz3) Rated current: 630A4) Rated active load breaking current: 630A5) Rated closed loop breaking current: 630A6) 5% rated active load breaking current: 31.5kA7) Rated cable charge breaking current: 10A8) Rated idling transformer capacity: 1,250kVA9) 1min power frequency withstand voltage: 42/48kV10) Lightning impulse withstand voltage: 75/85kV11) Rated short-time withstand current: 20/4kA12) Rated peak value withstand current: 5kA13) Rated short-circuit making current: 50kA14) Rated current breaking times: 10,000 times15) Mechanical life: 10,000 times16) Vacuum explosion chamber contact permission attrition thickness: 2mm17) Manual operation moment: ≤200N.mCombination electric appliance engineering parameters:1) Rated voltage: 12kV2) Rated frequency: 50Hz3) Fuse max rated current: 125A 4) Rated breaking AC current: 3,150A5) Fuse trigger switch on/off time: 40±5ms6) Rated short-circuit breaking current (effective value): 31.5kA7) Rated short-circuit making current (peak value): 50kA8) 1 min power frequency withstand voltage: 42/48kV9) Lightning impulse withstand voltage: 75/85kV10) Fuse rams output energy: 2-5JMechanical characteristic technical parameters:1) Distance of moving contact and fixed contact: 10±1mm2) Over-travel: 4±0.5mm3) Average closing speed:0.6±0.2m/s4) Breaking opening speed: 1.1±0.2m/s5) Three-phase contact closing/opening asynchronous: ≤2ms6) Contact closing bounces time: ≤2ms7) Air distance between charged body and to earth: ≤1258) Between upper and lower support main loop resistance: ≤70µΩ producing area:China payment:L/C at sight, T/T in advance