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# Varistor Specifications

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hi,

I need explanation for the following terms used in Varistor datasheets.

1) MAXIMUM ALLOWABLE VOLTAGE
2) VARISTOR VOLTAGE
3) CLAMPING VOLTAGE (MAX.)

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• Varistors (specs).pdf
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#### KlausST

##### Super Moderator
Staff member
Hi,

Read the given datasheet column "test conditions".

Klaus

Points: 2

FOR 20D431K Model

1) MAXIMUM ALLOWABLE VOLTAGE 275 (AC rms) 350 (DC)
2) VARISTOR VOLTAGE (387 〜473)
3) CLAMPING VOLTAGE (MAX.) (710)

I want to know the behavior of the 20D431K at these voltages.

#### KlausST

##### Super Moderator
Staff member
Hi,

What do you mean?

1) you must not connect more than 275V AC or 350V DC to the device for normal operation

2) With a constant current of 1mA there will be a DC voltage of 387V up to 473V across the varistor.

3) A current pulse of 100A will result in max 710V peak voltage across the varistor.

Klaus

- - - Updated - - -

Hi,

What do you mean?

1) you must not connect more than 275V AC or 350V DC to the device for normal operation

2) With a constant current of 1mA there will be a DC voltage of 387V up to 473V across the varistor.

3) A current pulse of 100A will result in max 710V peak voltage across the varistor.

Klaus

Points: 2

#### ravindragudi

##### Full Member level 3
The parameters 2) VARISTOR VOLTAGE & 3) CLAMPING VOLTAGE (MAX.) are used for comparison between different makes/ models of varistors. So that the V-I characteristics will provide a same baseline for comparison between different varistors and hence a better selection.