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    trythistofix's Avatar
    trythistofix Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Sep 26, 2013, 08:13 PM
    Transformer blowing fuse does not blow
    Transformer to central air is burning out but 3 amp fuse is still good. Any ideas?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Sep 28, 2013, 05:55 PM
    That's an odd one. Is this A/C only, A/C on a furnace, or a heat pump?
    KidChaos's Avatar
    KidChaos Posts: 45, Reputation: 3
    Junior Member
    		  
    #3

    Sep 29, 2013, 03:15 AM
    Actually a 3 amp fuse is almost a 75 VA transformers capacity
    3 amps times 24 volts = 72 VA
    If you have a smaller transformer than a 75 VA this explains it to me.
    For continuous a 75 VA transformer is - 20% od its rated VA
    So that 3 amps is really 2.4 amps continuous, take an amp draw and buy a 75 VA transformer with a circuit breaker built into it they are about $50.
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