... series, voltages range from 75V to 500V.Norminal D.C Spark-over voltage includes 75V,90V,150V,230V,350V,420V,500VModelGas ... : 5mm±0.2mm±0.2mmNominal .D.C spark-over voltage90VVTolerance of VS±20%Impluse spark-over voltage at 1KV/ μs≤650VImpluse discharge ... ΩCapacitance at 1MHz≤1.5PFHoldover voltage52 VDC ZM55 2R90L gas arrestor