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I think r1, r2 and c1 act also as voltage divider for rf frequency signals not to enter the supply from mains direction..though other way around for 'outgoing' emi it is exactly like Easy Peasy wrote.. I think Rf1 should anyway be non flammable type if it is being used in stead of fuse..it's just as dummy way to protect the supply like some old Philips tube tabletop radios have only the transformer overheat protector skipping fuse altogether..