Our gas discharge tube has got the TUV certification of German and SGS certification, satisfy the ROHS standard. ZM55 2R series, voltages range from 75V to 500V.Norminal D.C Spark-over voltage includes 75V,90V,150V,230V,350V,420V,500VModelGas Discharge TubeType: ZM 55 2R 90L ZM 55 2R 90LFZM 55 2R 90 LWith Lead WireZM 55 2R 90LFWith Lead Wire,Fail safeDimension ø5mmX5mmDiameter : 5mmLength: 5mm±0. ...