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How to "withstand 300VAC surgefor 5 seconds?"

Hi Experts, 

I have seen LED drivers having this specification: "withstand 300VAC surge for 5 seconds"

How do they achieve this? 

Mine is a constant current drive.

Current is 250mA.

LED driver is driven through AC mains of 230V/110V AC.

Output power = 18 watts.

Which MOV can do this work? Or is there any design that I should implement?

How to make a selection? any calculation sheet with an example will be of a great help.

Thank you, 

Rahul Shah