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METAL OXIDE VARISTOR
PERFORMANCE CHARACTERISTICS - ELECTRICAL


Characteristics Test Method Specifications
Standard test condition Environmental conditions under which every measuring is done without doubt on the measuring results. Unless specified, the temperature and relative humidity should be to 5 to 35 oC and 45 to 85% respectively.  
Varistor voltage The varistor voltage is measured with an impressed current of 1mA (exception, ø5: 0.1mA) and serves to characterize each varistor type. To meet the specified value
Maximum operating voltage The maximum sinusoidal RMS voltage or maximum DC voltage that can be applied continuoulsy in the specified environmental temperature range.
Maximum clamping voltage Maximum clamping voltage is the maximum voltage Vp between two terminals with the specified standard impulse current Ip (8 x 20µs).
Withstanding surge current The maximum current within the varistor voltage change of  ±10% with the standard impulse current (8 x 20µs )applies one or two times.
Energy The maximum energy within the varistor voltage change of ± 10% when one impulse of 10/1000 µs or 2 msec is applied.
Rated power The maximum power that can be applied within the specified ambient temperature.
Capcitance The capacitance of varistor is the typical value measured at 1KHz, 1Vrms max, OV bias and 20 ± 2 oC
Temperature coefficient of varistor voltage
Vc at 85 oC - Vc at 25 oC

  x (1/60) x 100  (%/ oC)
Vc at 25 oC
-0.05% /  oC max.

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