# Varistor rating

Discussion in 'Electronic Basics' started by Jack// ani, Dec 20, 2005.

1. ### Jack// aniGuest

Hi all,

I've two varistor....from two different PCI dialup modem. TUR 07271 and
ZOV 07D241K is written over it...was is the voltage and current rating
likely to be, how to read it??

Thanks

2. ### John PopelishGuest

I think the 07 (or 07D) prefix refers to 7mm diameter. Is this about
the size of the disk under the epoxy coating?

I think 271 refers to a 27*10^1-270 volts AC and 241 refers to 240
volts AC. The DC peak rating will be about 1.4 times that.

If you look up this size and volt rating MOV from almost any
manufacturer, you can get some pretty good ideas of the surge current
ratings.

For example:
http://www.epcos.com/inf/70/db/var_01/01590173.pdf

3. ### Jack// aniGuest

Thanks John. Oh...yes, physical size is around 7mm as you said....I
hope the rating are also true.

4. ### Franc ZabkarGuest

ZOV = zinc oxide varistor ???

- Franc Zabkar

5. ### Guest

TVR 07271 and ZOV 07D241K

TVR and ZOV is the brand of the varistors which the manufacturers
produce.They are electronic company in Taiwan and the factory in China
mailand.

Sometimes ZOV = zinc oxide varistor ,just like MOV=metal oxide
varistor.

Jashon in CHina

Franc Zabkar å†™é?“ï¼š

6. ### Guest

You are right.TVR 07271:
the 07 (or 07D) prefix refers to 7mm diameter. this is about
the size of the disk under the epoxy coating.

But 271 refers to a 27*10^1-270 of VARISTOR VOLTAGE RATING.What is the
Varistor Voltage rating?

Varistor Voltage Rating (Vdc):
The peak DC voltage measured across the varistor when a specified
current, Ic, is applied. For 5mm devices, Ic=0.1mA; for 7,10,14,20mm
devices, Ic=1.0mA.

Also the surge current means Max. surge current under impulse current
(8x20us waveform) instead of the normal current.

I have worked in a varistors manufacturer.Now we sell the MOV.

Buy the way,how do you think the varistor market in your market?

7. ### Guest

TVR 07271 and ZOV 07D241K

TVR and ZOV is the brand of the varistors which the manufacturers
produce.They are electronic company in Taiwan and the factory in China
mailand.

Sometimes ZOV = zinc oxide varistor ,just like MOV=metal oxide
varistor.

Jashon in CHina

Franc Zabkar å†™é?“ï¼š