Rated voltage AC 220V Rated frequency 50/60HZ Overvoltage setting range 230-300V Undervoltage setting range 120-220V Tolerance scope 2% Overvoltage and undervoltage action delay 0.5S Reset start-up delay 3S-300S Voltage measurement accuracy 1%( <1 % of total range ) output contact 1 NO Environmental grade 3 Electrical life 105 Mechanical life 106 Protection class lp20 Altitude ≤2000m Ambient temperature -55°C 〜55°C Humidity ≤50% 40°Cnon-condensing storage temperature -30°C~70°C