Cucab gives you some knowledge in this area.
X2 capacitor and Y capacitor are both classified as safety capacitors, but their use occasions are not the same: X capacitor is between the front and zero line, and Y capacitor is between the front and ground line.
Y capacitor is used in most electronic devices, and one of its more important roles is to prevent lightning strikes: Y1Y2 ceramic capacitor is like most electronic products, the peak current and voltage will be designed to maintain the circuit when encountering lightning strikes, and we don’t worry about the damage to the product, and the peak withstand voltage is the primary circuit with safety Y capacitor, so we can say that safety Y capacitor is the maintenance god of power supply. If we do not have Y capacitor in our appliances, in the summer thunderstorm climate is very simple to damage or even endanger our personal safety.
Anchor capacitor

Anchor capacitor

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