The role of X capacitor and Y capacitor

In fact, the difference lies in their connection, the role of no essential difference. In simple words, the following two points.

1, the difference is that the X capacitor is not grounded, Y capacitor must have a ground wire.

2, most of the X capacitor is a four-square, Y capacitor is a round piece of ceramic media.

More specifically on the following:

X and Y capacitors are safety capacitors, the difference is that the X capacitor is connected to both ends of the input line to eliminate the differential mode interference, the Y capacitor is connected to the input line and the ground line, used to eliminate **** mode interference.

The X capacitor is a molded square high-voltage CBB capacitor, which not only has better electrical performance, but also can be connected in parallel with the input of the power supply to effectively reduce the impact of high-frequency pulses on the switching power supply.

Y capacitor --- often used high-voltage ceramic tiles. Y-type capacitors connected between the phase line and ground. In order not to exceed the permissible leakage value of the ground line limited by the relevant safety standards, the value of these capacitors is about a few nF. Generally, the Y capacitor should be connected to the conductor of the larger noise interference. Y1 belongs to the double insulated Y capacitors, used to cross the primary and secondary sides. Y2 belongs to the basic single insulated Y capacitors, used to cross the primary side of the protection of the earth that is the FG line.

The X and Y capacitors are collectively known as safety capacitors, which are used in situations where the failure of a capacitor will not result in an electric shock or jeopardize personal safety.

Safety rating of safety-gauge capacitors Peak pulse voltage permitted in applications:

X capacitors are subdivided underneath into X1, X2, and X3, with the main differences being:

a. X1 withstanding high voltage is greater than 2.5 kV, and less than or equal to 4 kV;

b. X2 withstanding high voltage is less than or equal to 2.5 kV;

c. X3 withstanding high voltage is less than or equal to 1.2 kV;

c. 1.2 kV;

Y capacitors are divided into Y1, Y2, Y3 and Y4, the main differences are:

a. Y1 with high voltage greater than 8 kV;

b. Y2 with high voltage greater than 5 kV;

c. Y3 with high voltage n/a;

d. Y4 with high voltage greater than 2.5 kV;

d. Y4 with high voltage greater than 2.5 kV.