Songtian CD series X1/Y1 ceramic capacitor upgraded safety certificate of UL, VDE and CQC certificate to 500 VAC.The updated certify voltage of 500VAC is reaching criteria of Vishay VY1 series. It is widely used in industrial area. Here to list some:Example Industrial Application 
To be coming: We are upgrading our CE series Class Y2 250VAC ceramic capacitor with certify voltage at 300VAC, which will widen alternatives for proposal. Look forward to our updates