What are the capacitances of Y capacitors?

The Y capacitor is one of the safety capacitors and the importance of the role in the circuit cannot be ignored. It can be said that if the Y capacitor does not exist, then there is no safety performance at all. The capacitor connected between the live line and the ground line and between the neutral line and the ground line is called a Y capacitor. It is because of its existence that it ensures the safety of such capacitors. Ensure that these capacitors meet all safety standards and requirements. As a y capacitor for a safety capacitor, it must be certified by a safety inspection agency.

The main function of the Y capacitor is to suppress EMI conducted interference. Used to eliminate common-mode interference and eliminate high-frequency interference above 1M. It is also the capacitance across the power line between the two lines and the ground (L-E, N-E), usually in pairs. The Y capacitor ground acts as a filter. Based on the restriction of the leakage current, the value of the Y capacitor cannot be too large.

What capacitance specifications do Y capacitors have? The Y capacitor has a capacity from 10PF to 10000 PF. Different voltage specifications, the corresponding characteristics are different, the error is also different, the size of the various parts are also different. Please refer to the following table.

The appearance of Y capacitors is mostly blue. They are generally marked with safety certification marks (such as UL; VDE; ENEC; CQC; KC, etc.) and pressure-resistant AC300V or AC400V. However, its true DC withstand voltage is up to 4000V. It must be emphasized that the Y capacitor must not be used as a substitute for ordinary ceramic capacitors.

The Y capacitor ground acts as a filter. Based on the leakage current limitation, the Y capacitor value cannot be too large. The capacitance of the y capacitor varies from 10 PF to 10000 PF. The voltage specification is different, the corresponding characteristics are different, the error is also different, and the size of each part of the y capacitor is also different. The appearance of the Y capacitor is mostly blue, and it is not allowed to use an ordinary ceramic capacitor instead.