... ,high reliability*double isolation of the input and output ,safe and reliable*output the pure sine wave,low ... %Reactime:≤2msDigital meter indication:Frequency,voltage,current,power and power factor meterWorking temperarure:-28°C-60°CRelative ... overvoltage, overheat,overload protection and automatic warning devicescooling system:Forced fan cooling 3KVA 400HZ frequency and voltage regulator high voltage ...