1) Add an overvoltage protection circuit to prevent high voltage. 2) Use a set of differential mode filters and two differential inductors to perform differential mode filtering on the AC power supply to suppress mid- and high-frequency interference. 3) Three sets of common mode filters are combined by X2 capacitor and common mode inductor to form a common mode filter. Due to the use of three-level (also known as three-level) filtering, the effect of filtering out noise is better. It can effectively suppress the fast transient group pulse interference problem of some user sites with a repetition frequency of several thousand hertz. Type:EMI filter Style:EMC Safety Rules FCC :Electrical EMI filter:AC 220v power supply Four-stage (four-stage) EMI line filter Input voltage:single-phase AC 110-250V Output voltage:single-phase AC 110-250V Input port:three-wire 7.62 socket input Output port:three-wire 7.62 socket output Function: Overvoltage protection (surge protection) Short circuit protection Differential mode + common mode bidirectional EMI filtering to prevent interference Extend the service life of electrical appliances and increase equipment stability Load rated current:4A Colour:As Shown Material:ABS Package Contents: 1 * filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.