1.
Rated working voltage: the maximum direct current voltage a capacitor can withstand when operating reliably for a long period of time within the specified operating temperature range. In ac circuit, it should be noted that the maximum value of ac voltage should not exceed the dc working voltage of capacitor. Commonly used fixed capacitor working voltage is 6.3v, 10V, 16V, 25V, 50V, 63V, 100V, 200V, 250V, 400V, 450V, 475V, 500V, 600V, 630V. 2.
The actual voltage that a capacitor must withstand in a circuit cannot exceed its voltage value.
In the filter circuit, the voltage withstand value of capacitor should not be less than 1.42 times of RMS of ac. Another problem to pay attention to is the operating voltage margin, generally more than 15%.
3.
The rated voltage of capacitor has more margin, which can reduce internal resistance, reduce leakage current, reduce loss Angle and increase life. Although it is said that the working voltage of 48V will not be a problem if 50V aluminum electrolytic capacitor is used for a short time, the service life may be reduced if it is used for a long time.