Mostly purpose ZW□-12GG/630-20type high-voltage dual power inter-transfer decive(hereinafter called device)is composed of one set of high-voltage vacuum vircult breaker and intelligent controller.applied in ac50hz dual power supply system with tated voltage of 12kv ,rated current to 630a,when one way of power supply is cutting off or under voltage,it can automatically transfer into the other normal power supply to ensure the continuity of power supply.meanwhile it owns protection of interlock function for short-circult and over current,which effciently avoid unnecessary power supply impact once more in load fault,for electricity cutting off of common used power supply the device can do auto transfer of standby power supply to ensure safety and reliability,and it also do selective transfer between the two ways according to load requl rement.it is especially applicable as key electric control device of continuous power supply for key localtion where doesnot allow electric cutting off.it is a auto self-transfer product with new design,perfect performance,reliable safety,high automatization and wide use,it ensure the total disconnecting of the tow ways product is applicable for users who require high reliability and safety dual power supply as control and protection for power system. Technic parameter itemunitparameter rated voltagekv12 maximum working voltagekv12 rated currenta630 ka20 rated short current switching current (peak value)ka50 rated peak value withstand currentka50 1minrated short time withstand currentka20 rated insulation levelpower frequency withstand coltagekv42 lightning impulse withstand voltage(peak value)75 rated operating sequence o-0.3s-co-180s-co mechanism lifetimes10000 breaking current frequency under rated shout circlttimes30 operating mechanism rated switch-on voltagev220 operating mechanism rated switch-off voltagev220 contact openingmm9±1 overtravelmm3 three-phase switching on or off non-synchroneityms≤2 contact closing bounce timems≤2 average switch of speeds1.2±0.2 switch-off timeunder maximum operation voltages0.025-0.05 under minimum operation voltage0.03-0.06 switch-on times0.025-0.05 loop resistanceμΩ≤180 each phase loop dc resistancemm3Outdoor High Voltage Vacuum Breaker factory website:http://www.longroadsolar.com/outdoor-high-voltage-vacuum-breaker/