X capacitor

In power supply circuits, among the capacitors installed on the primary side for purposes such as removing noise, those placed between lines are referred to as such. They are also called across-the-line capacitors. If an X capacitor fails, the risk of electric shock is lower compared to a Y capacitor; however, since a short circuit between lines can cause equipment failure, electric shock, or fire due to current, strict standards have been established. The standards for X capacitors are JISC5101-14 for domestic standards and IEC60384-14 for international standards.