type of Capacitor
They are designed to fail safely. Designed to be used between isolated grounds or line to ground in power supplies. Main role is to supress commond mode EMI while maintaining electrical isolation. We should use Y1 Y2 or X class based on regulations. For medical device applications, you can find Y1 or Y2 class caps certified under IEC 60384
Lets divide into 2: X capacitor Y capacitor