AC blower starting capacitor

Discussion in 'HVAC Heating & Cooling' started by Bobver, Jun 29, 2009.

  1. Bobver

    Bobver New Member

    Messages:
    3
    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.
  2. geno54

    geno54 New Member

    Messages:
    29
    Not a problem. You can go up in rated voltage but not down
  3. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Ditto.
    ******
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,319
    Location:
    New England
    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.
  5. Bobver

    Bobver New Member

    Messages:
    3
    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.
  6. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    AC voltage rating = "bipolar" capacitor. They have a ripple current rating because this current causes internal heating, which shortens service lifetime.
  7. Bobver

    Bobver New Member

    Messages:
    3

    I learn something new every day. Thanks . :)
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