Star DDS26B (IV) Electronic Single Phase Watt-hour Meter is a brand-new and high-tech product, which adopts one special large-scale IC, the latest micro-electronic technologies and SMT techniques. It also takes more allowable ambient errors for circuit design and components selection so that the long-term operation stability can be guaranteed Function: New exterior design, using transformer power supply. Has a long life, high accuracy, power consumption, small size, light weight and high overload capacity. Applicable condition: Ambient temperature: -25 ℃ ~ 65 ℃, maximum relative humidity: 100% Operating voltage range: 220/230/240V (-30%? +20%), Frequency range: 50/60Hz ± 5%. Electrical Features Accuracy Class Class 1.0 / 2.0 Rated Voltage 220V Rated Frequency 50/60Hz Start Current 0.002Ib Voltage Circuit Power Consumption <=0.8W,6VA Current Circuit Power Consumption <=0.2VA Display LED,5 Integers & 1 Decimals Nominal Current 1.5(6)A,2.5(10)A,2.5(15)A 5(20)A,5(30)A,5(40)A 10(40)A,10(50)A,10(60)A Meter's Constant(imp/kWh) 12800/6400/3200/1600 Physical Features Weight 0.8Kg Outside Size 192mm*112mm*60.5mm Ambient Temperature -25'C~6'C Max Relative Humidity 100%