Metalized paper/film and ceramic are two common types of capacitors. Y-capacitors, on the other hand, are meant to filter out common-mode noise and are linked between the line and the chassis if they short-circuit, the user risks being shocked.įigure 1: Placement of Class-X (CX) and Class-Y (CY) safety capacitors. Their failure does not result in a deadly electric shock, but it does pose a fire hazard. To defend against differential mode interference, X-capacitors are linked between the line and the neutral. X-capacitors and Y-capacitors are the two types of line filter capacitors. The safety of the equipment’s users is dependent on the capacitors’ dependability. Manufacturers include capacitor-based power line filtering into their systems to isolate any common-mode noise generated by the device’s power source from reaching other equipment through the mains power line. Y capacitors are used to filter the common-mode noise out. If this is permitted to return to the mains supply line, it may cause problems for other equipment connected to the same line. When electronic equipment is linked to the AC mains, common-mode electrical noise can be generated.
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