Technical specification: Type:D30x20 Material: Zinc oxide Demensions: diameter 30 mm , height 20mm D.C reference voltage:4.0-4.8KV Leakage current at 0.75 time D.C reference voltage: <10μA Rated voltage: 3KV Continuous operating current: 2.4KV Long durationg(2ms rectangular) current impulse withstand:120A 4/10μs high current impulse withstand:65KA Residual voltage at nominal disscharge current:5KA