Am not precisely sure why voltage rating should be so high unless it might have something to do with region or extra safety precautions. It would seem that in a 240v region the 275VAC rating would suffice; possible I'm wrong about this. It's important it have a X2 (class 2) safety rating and be in a range of .01uf to .068. Some models have resistors included in the cap; typical example might be Eichoff k005-701/100 (47nf, 100Ω). I read one report which said the 0.68 was more effective than the 0.47.
Possible sources could include Digi-Key.com, Mouser.com, Buerklin GmbH. Might be good to know the best candidates and choices for this application (some precise part numbers), and how important the resistor is to the solution.
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