How to select the withstand voltage value of electric fan starting capacitor

The ac motor of an electric fan generally requires a starting capacitor. The capacitance mainly depends on the capacity and voltage resistance value.

How to choose the withstand voltage value of electric fan starting capacitor?

In order to ensure that the electric fan can operate reliably and stably, the withstand voltage value of the starting capacitor must be more than 1.5 times the working voltage, preferably 2 times.

If the working voltage is AC 220V, then the withstand voltage value of the starting capacitor must be greater than 220x1.5=330V, then a starting capacitor with a withstanding voltage of 400V can be used. However, it can achieve twice the withstand voltage 220x2=440V.

Therefore, both 400V and 450V voltage-resistant capacitors can be used in electric fans. If you must choose one of the two, of course use 450V voltage-resistant capacitors.

The withstand voltage values are different, but as long as the capacity values are the same, they can be used universally. Because capacitors are used to start, it means that 220v AC voltage is used. Its peak value is more than 300V, and it can be used with a voltage resistance of 400v and above.