... 30A 40A 50A 60A Anolog panel meter,current meter,ammeter,voltage meter,frequency meter: The scope of applicationThe series product ... distribution system to indicate relativeparameter,such as AC,DC,Voltage,power synchronous volume,frequency,expended voltage and overload current etc.The product ... 250V 450V 500V 600V,external connected the secondary 100V voltage transformers when the voltage above 600V