Efficient large power circle transformer, low magnetic leakage, low noise, strong over loading resistance and high reliability;（PS1000-□A） Micro processor controls short circuit and overload protection circuit;（PS1000-□A） Magnetic saturation power transformer, stable output voltage and better ability of anti-jamming.（PS1000C-□A） Displaying accurate working current ; Double fuses at power supply input port, against thunderstroke design; Individual current switch at input and output port; Waterproof crust ,suitable for indoor or outdoor. With power supply and power inserting functions;