1.longevity 2.light weight 3.nice appearance 4.low noise Single-phase combined-type meter box (with small master control box) (card)1, product scope and application conditions LiuNa series plastic meter box including single-phase and three-phase meter box two parts,Suitable for ac 50 hz or 60 hz,Rated voltage 220 volts, 380 volts, 690 volts,Rated current for 10 volts to 255 volts power supply ...