The pulse surge and overvoltage protection circuit adopts discharge diodes and transient voltage suppression diodes, providing multiple protections to effectively prevent damage to equipment caused by surges, high voltage, strikes, etc. Three sets of common-mode filter, through the X2 capacitors and common mode inductor, combined into the common mode filter. Due to it is use of three stages filtering, so the filtering effect is more better. In view of the problem of rapid transient group pulse interference with repetition rate of several kilohertz in some users, it can play an inhibitory role. Notice: This filter filters high-frequency interference components in the AC power supply, preventing interference from the power grid from entering electrical equipment, and also preventing interference from equipment from entering the power grid and interfering with other electrical equipment. Used in power amplifiers and speakers, it can only improve the quality of the power supply and cannot solve the problem of current noise. Color: As Shown Material: PCB Specification: 18A Filter Package Contents: 1* power 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. 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.