AC blower starting capacitor

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Bobver

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Can a 7.5uF, 370 VAC run capacitor on my AC blower be replacled with a 7.5uF, 440 VAC capacitor? If I do, will it cause a problem? Thanks.
 

geno54

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Not a problem. You can go up in rated voltage but not down
 

Jadnashua

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The voltage rating on a capacitor (similar to the insulation on a wire) is the max supported before it could arc or short out by jumping between the insulation and the working parts. So, with what you have, you are getting a better rating.
 

Bobver

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The voltage rating on a capacitor (similar to the insulation on a wire) is the max supported before it could arc or short out by jumping between the insulation and the working parts. So, with what you have, you are getting a better rating.

I understand well the VDC rating of capacitors. I have just never heard the voltage rating of capacitors expressed in therms of AC voltage before. Thanks.
 

Thatguy

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I understand well the VDC rating of capacitors. I have just never heard the voltage rating of capacitors expressed in therms of AC voltage before. Thanks.
AC voltage rating = "bipolar" capacitor. They have a ripple current rating because this current causes internal heating, which shortens service lifetime.
 

Bobver

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AC voltage rating = "bipolar" capacitor. They have a ripple current rating because this current causes internal heating, which shortens service lifetime.


I learn something new every day. Thanks . :)
 
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