AC blower starting capacitor

[Bobver]

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]

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

[Thatguy]

Ditto.
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[jadnashua]

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]

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]

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]

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 .