Metal Oxide Varistor

Why is it called a varistor

Varistor is a sensitive component. It is a nonlinear electronic component. Because it is sensitive to voltage, we call it "varistor". Its main function is to clamp the surge voltage. "Varistor" is the most common name, Taiwan compatriots like to call it "MOV" or "surge absorber", and the most commonly used English word is "Varistor".

MOV has typical nonlinear volt-ampere characteristics, (used in parallel with the protected components during circuit installation) when the voltage in the circuit is normal, the impedance of MOV is infinite; but when a surge occurs, the voltage through MOV reaches At a certain value, the MOV will be turned on quickly (response time is about a few nanoseconds), so that the current passes through the front loop of important components, limiting the voltage across the piezoresistor, thereby protecting the back Important components such as thyristors, bridge rectifiers, loads, etc.

①,According to the circuit environment, MOV is used in all circuits with transient overvoltage.

②,According to the senses, all electric or electronic circuits should have MOV.

1.During the conversion of alternating current to direct current

2.Surges generated by electrical switches, i.e. operating overvoltages

3.Lightning's Ground Potential Counterattack

4.Induction of electromagnetic pulses such as lightning

5.Loss of zero in the power distribution system or poor connection of the neutral wire or other faults

6.Harmonics generated in power transmission and distribution

A,Maximum continuous working voltage

B,Varistor voltage

C,leakage current

D,Static power

E,Static capacitance

A,8/20μS Surge withstand capability

B,Compound pulse withstand capability

C,Energy tolerance

D,Special process: short circuit current withstand capacity

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