METAL OXIDE VARISTORS
Transient voltage surge suppressors
Environmental conditions under which every measuring is done without
Standard Test Condition doubt on the measuring results. Unless specially specified. Temperature.
Relative humidity are 5 to 35˚C 45 to 85%RH.
The maximum sinusoidal RMS voltage or maximum DC voltage that can
Maximum Allowable Voltage be applied continuously in the specified environmental temperature range.
The voltage between two terminals with the specified measuring current
Cm A DC applied is called Vc or VcmA, the measurement shall be made as
fast as fast as possible to avoid heat affection.
The maximum voltage between two terminals with the specified standard
impulse current (8/20µs) illustrated below applied.
To meet the
The maximum current within the varistor voltage change of ±10% with the
2 times standard impulse current (8/20µs) applied two times with an interval of 5
The maximum current within the varistor voltage change of ±10% the
standard impulse current (8/20µs) applied one time.
The maximum energy within the varistor voltage change of ±10% when
one impulse of 2 ms or 10/1000µS is applied.
The power that can be applied in the specified ambient temperature.
Temperature Confident of
Capacitance shall be measured at 1 kHz ±10%, 1Vrms max.(1Mhz below
100pF). 0V bias and 20 ±2˚C
Dissipation Factor shall be measured at 1 KHz±10%, 1 Vrms max.(1Mhz +
%10 below 100pF). OV bias and 20 ±2˚C
Vc at 85°C - Vc at 105°C x 1 x100(% / .°C)
Vc at 25°C
The specified voltage shall be applied both terminals of the specimen
connected together and metal foil closely wrapped round its body for 1
minute. Electrical Breakdown shall be examined.
Classification(Nominal varistor voltage) Test Voltage(AC)
VO.1ma. V1mA > 330V
TO BE CONTINUED