Zinc oxide varistor selection

Selection of TGE Glass Coating varistors before, you should first understand the following related technical parameters: Nominal voltage is at a predetermined temperature and DC flow, voltage across the varistor. Leakage current is at 25 ℃, when the application of the maximum continuous DC voltage, varistor flowing current value. Level refers mov metal oxide varistor voltage by 8/20 rating current pulses at both ends exhibit voltage peaks. Through traffic is applying a predetermined peak current pulse current (8 / 20μs) waveform when. Surge environmental parameters include a maximum inrush current Ipm (or the maximum surge voltage and surge Vpm source impedance Zo), surge pulse width Tt, the minimum time interval of two adjacent surge Tm and scheduled TGE high voltage varistor working life period, the total number of surge pulses N and the like.