Answer
If it is a continuous vibration sound, the capacitor is fine. Applying a voltage to the capacitor generates a Coulomb force acting on both electrodes. This causes plastic films, which are dielectric materials, to vibrate mechanically, thus creating a groaning noise in some cases. This noise could be a high pitch noise when the source voltage waveform contains distortions or harmonic components. However, this does not affect the electric properties of the capacitor. In case you hear a sound or noise exceeding an allowable sound level or one that is sporadically explosive, feel free to contact us.
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