Selection and Precautions for Varistors
2020-04-13
Before selecting a varistor, it is important to understand the following relevant technical parameters: The rated voltage refers to the voltage value across the varistor under specified temperature and direct current conditions. The leakage current is the current value flowing through the varistor when the maximum continuous direct current voltage is applied at 25°C. The rated voltage is the peak voltage across the varistor when subjected to an 8/20 current pulse. The current capacity indicates the peak current when a specified pulse current (8/20μs) waveform is applied. Surge environment parameters include the maximum surge current Ipm (or maximum surge voltage Vpm and surge source impedance Zo).
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