how to choose a gas-filled overvoltage arrester?

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overvoltage arrester gas

How to choose a gas-fileld overvoltage arrester for a circut in respect of the nominal DC spark-over voltage & discharge current?

The operation voltage of my circuit is 230V. I note that the nominal DC spark overvoltage is normally rated at 90V, 230V and 350V etc... therefore for my circuit, which one should i use?
 

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