Why does the film capacitor make a sound when working

Many people feel that film capacitors should be very quiet when working, or even feel that there should be no sound at all. In fact, this is not the case. In some application scenarios, film capacitors may make obvious sounds when working.

Why does the film capacitor make a sound when it is working?

The root cause of noise:The noise of film capacitors may exist in some specific working situations, such as cross-line, voltage step-down and other AC situations. This is because there is a gap between the films and vibration occurs under the action of the alternating electric field.

Film capacitors produce noise when working. Will this affect their safety and lifespan?

There is no need to worry too much about this. According to current technology and statistical data, the noise of film capacitors has no significant impact on the performance of capacitors. It is generally caused by manufacturing process reasons, and technological progress will significantly improve or solve this problem.

Generally speaking, factories with better production processes will produce film capacitors with relatively less noise.