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Old 12th Apr 2021, 6:42 pm   #3
Lucien Nunes
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Join Date: Apr 2008
Location: London, UK.
Posts: 1,959
Default Re: Capacitor voltage ratings: AC / DC / dual

By default, voltage ratings quoted for film capacitors for electronic applications or in an electronic context will be DC, while those for electrical machinery (e.g. motor run caps) are normally AC. The sum of the DC and any superimposed AC peak should not exceed the DC rating.

Additional ratings and parameters come into play with capacitors intended for severe duty such as fast-risetime impulses. It is not then safe to assume that the AC and DC ratings will be in the ratio of sqrt(2) as the dielectric losses and dV/dt may be limiting factors.
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