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Varistor for transformer protection

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Kick

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Hiii all,

I am just confused with parameters of Varistor, Varistor Voltage and Maximum AC Volts. What I want is,I need to add one varistor for 230V transformer protection(Voltage spike). I think this transformer can not carry more than 230V (according to datasheet).So Which parameter should I choose?
 

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stefano.delfiore

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Varistors or VDRs are intended to protect electronics only from voltage spikes.
A well designed 230 V transformer must work at the maximum value of 253V (230V + 10%). Tipically across a 230V mains is used a varistor rated at 275V an example could be the Epcos S14K275. (http://en.tdk.eu/inf/70/db/var_11/SIOV_Leaded_StandarD.pdf ) This component has a diameter of 14 mm, the diameter is an important factor because greater the diameter of varistor greater the energy (of the spike) it can manage.

Stefano
 

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