It is a component used to suppress conducted and radiated electromagnetic interference in electronic equipment. It is usually used to filter out interference caused by the device itself or external electromagnetic sources to ensure the normal operation of the device.
X1/X2 is used for AC power line filtering and over voltage suppression. It complies with the IEC 60384-14 standard. For example, X1 level meets the high voltage withstand requirements, and X2 level meets the medium voltage withstand requirements. It is used to suppress over voltage and electromagnetic interference in AC power lines, and Y2 level is used to insulate unconventional power supplies.