Capacitor

: What Is an X Capacitor? Function, Selection, and Safety
2026/11/2
When researching noise suppression in power supply circuits, you may come across a component called an X capacitor. Where is an X capacitor connected, and what does it do? This article uses diagrams to explain the following aspects of X capacitors in an easy-to-understand way: What X capacitors do How to select an X capacitor Electric shock precautions after unplugging the AC power plug What Is an X Capacitor? An X capacitor is a safety-rated capacitor connected across the AC supply lines to reduce noise. In a single-phase line-to-neutral supply, it is connected between line (L) and neutral (N). Its ...

: What Is a Y Capacitor? Classes, Leakage Current, and Safety Explained
2026/11/2
When researching noise suppression in power supply circuits, you may come across a component called a Y capacitor. This article uses diagrams to explain the following topics: What Y capacitors are and what they do Differences between subclasses Y1, Y2, and Y4 The relationship between capacitance and leakage current Electric shock precautions What Is a Y Capacitor? A Y capacitor is a capacitor connected between an AC power line—line (L) or neutral (N)—and ground (GND). Y capacitors help suppress common-mode noise. By providing a bypass path for high-frequency noise current, they can reduce the noise flowing back to the input ...